If you fancy a good documentary marathon without paying a single euro, RTVE Play is currently one of the best hidden gems you can enjoy from the comfort of your sofa.Their catalog blends captivating biographies, science for all ages, gripping true crime stories, and historical series that feel almost like fiction, but with the advantage that it's all real. And the best part: they're all available online, free, and without a subscription.
Based on public information from RTVE and the content that has been most popular, We've put together a selection of the best documentaries and documentary series you can watch on RTVE PlayLet's review some powerful original productions such as 'The final frontier' o 'Susana and sex'audience successes such as 'Ruiz Mateos: the first viral phenomenon', historical jewels such as 'Roman engineering' and Spanish true crime series as addictive as 'Lucía in the spider's web', in addition to a highly anticipated premiere about the figure of Waldo de los Ríos.
Documaster and the premiere about Waldo de los Ríos
Within RTVE's documentary offering, the Documaster series functions as a kind of quality seal.Under this umbrella, in-house productions and international acquisitions are broadcast and made available online, distinguished by their rigor and educational value. One of the most striking titles is the one dedicated to Waldo de los Ríos, a composer as celebrated in his time as he is unknown to some of today's audiences.
The documentary “Waldo” focuses on the life and death of the Argentine-Argentine-Spanish musician Waldo de los Ríosresponsible for one of the most popular versions of the "Ode to Joy". The program aired on 25 June, 2025 and has an approximate duration of 1 hour, 45 minutes and 8 seconds, a period in which his career is reviewed from its beginnings to its abrupt end.
In March 1977, Waldo de los Ríos was found dead in circumstances that forever marked his legacyHis death, shrouded in a mix of personal tragedy and professional pressure, serves as a narrative thread to explore a life surrounded by fame, international success, luxury, and great passions. The documentary also delves into his inner conflicts and the impact he had on popular music, with orchestral arrangements that brought classical pieces to the top of the charts.
Throughout the footage, It combines testimonies from people close to the artist, archival material, and analysis from music experts.It reconstructs his years of greatest popularity, his leap to Europe, his relationship with the recording industry, and the pressure of maintaining such a high level of success during a media explosion. Despite its cultural relevance, the piece still appears with “ND” (not available) classification in some official listings, which indicates that the technical specifications are still being completed or updated.
The approach that Documaster offers on Waldo de los Ríos It does not limit itself to the morbid fascination with his death, but attempts to vindicate his figure as a creatorThe documentary explains why his version of "Ode to Joy" resonated with an entire generation and places his work within the context of popular and symphonic music of the time. For any music lover, it's an essential viewing for understanding how a composer can become a popular phenomenon and, at the same time, fade into obscurity over the years.
The most viewed documentaries on RTVE Play
In recent years, RTVE Play has been publishing lists of its most-watched documentaries, which gives very clear clues about what the audience is really looking for.Science, sex, power, economics, controversial figures, and unsolved crimes. The 2021 ranking is particularly representative because it blends all these ingredients into five very powerful titles.
The number one on the list was 'The final frontier', defined by the platform itself as the most watched documentary on RTVE Play in 2021This original series offers a journey through the great mysteries of the universe, space exploration, and the people who dream of reaching beyond Earth's orbit. The content is designed for a broad audience, requiring no prior technical knowledge, yet it's in-depth enough to appeal even to the most dedicated astronomy enthusiasts.
In 'The Last Frontier' It explains what it takes to become an astronaut today.From the physical demands to the scientific training, including the ability to work as a team in extreme environments, the series covers a wide range of experiences. It also explores current space technologies, projects from agencies like ESA and NASA, and the challenges of traveling further into the solar system. The result is a compelling combination of scientific outreach, adventure, and human emotion.
The second place in the ranking goes to 'Susana and sex', Another RTVE Play original documentary focusing on the figure of Susana EstradaShe was one of the great protagonists of the Spanish transition in terms of sexual freedom and entertainment, and became the first artist in Spain to perform a striptease on stage in an open, media-friendly and groundbreaking manner for the time.
In this piece, Susana Estrada's artistic and personal career is reviewedThe documentary explores her relationship with late Francoist censorship, the scandals she was involved in, and her role in the country's social and cultural opening. Beyond sensationalism, it examines how she used her body and public presence to challenge the boundaries of what was acceptable and contribute, in her own way, to the shift in mentality in Spain during the late 70s and early 80s.
The bronze medal in 2021 went to 'Ruiz Mateos: the first viral phenomenon', dedicated to the controversial and media-driven business world José María Ruiz-MateosThis documentary It tells the story of a character who was many things at once.: businessman with an economic empire, protagonist of the Rumasa case, politician with his own party, sports leader and, above all, a television animal capable of putting on a show wherever he appeared.
The piece highlights how, in an era without social media, Ruiz-Mateos was able to become a mass phenomenon using only television and traditional mediaHis appearances dressed as "Superman," his media attacks on ministers, and his memorable quotes foreshadowed, in a way, the type of hyper-visible public figure who thrives on the internet today. The documentary examines both his rise and fall, the economic impact of his businesses, and the fascination he continued to generate even at his lowest points.
Among the five most viewed of the year was also... one of the episodes of the series 'Roman Engineering', specifically the one dedicated to miningThe fact that a chapter focused on such a technical issue as mining in Roman times ended up in this top list says a lot about the public's interest in history when it is told well, with pace and powerful visual resources.
Rounding out the top five was 'Lucía in the spider's web', an original RTVE Play documentary series that reconstructs the unsolved murder of Lucía GarridoThrough several episodes, a case full of shadows, questionable police decisions, unexpected connections and gaps in the investigation that have kept the matter in a kind of judicial and media limbo is dismantled step by step.
'The final frontier': science, space and astronaut vocation
'The Final Frontier' is one of those documentaries that captivates whether you know the Apollo missions by heart or can barely distinguish a satellite from a shooting star.RTVE Play opts here for a highly visual narrative, with images of space, recreations, interviews and training clips that give a fairly realistic idea of what it means to live with your eyes on the cosmos.
One of the central themes of the documentary is exploring the requirements to become an astronautIt's not just about being physically fit: it involves scientific training, emotional intelligence, the ability to endure long periods of isolation, and the need to work under pressure in an environment where any mistake can be extremely costly. It also reveals the more human side of those who aspire to fly in space, their family sacrifices, and their almost obsessive motivation.
The documentary delves into the great enigmas of the universe that are still on the tableThe book covers the possible existence of extraterrestrial life, the nature of dark matter, the limits of what we can observe from Earth, and the challenges of future missions to Mars or other bodies in the solar system. Without becoming a lecture, it introduces key concepts in a way that is easy for anyone to understand.
RTVE Play takes advantage of the popularity of this theme to to offer an experience that blends emotion, knowledge and audiovisual spectacle'The Last Frontier' is a good entry point if you want to start exploring the science category within the platform, and also a perfect title to watch as a family and awaken scientific vocations among the youngest.
'Susana and sex': freedom, scandal and transition
If you're into recent Spanish history, but told from the perspective of its most daring characters, 'Susana and Sex' is a key documentary for understanding the transition from the perspective of the body, desire, and public provocation.RTVE Play focuses here on Susana Estrada, an icon of erotic culture and the sexual revolution.
The documentary recalls how Susana Estrada became the first artist to perform a striptease on a Spanish stageAnd how that gesture, which today may seem almost innocent, was an act of direct defiance against the official morality of the late Franco regime. His performances, television appearances, interviews, and the controversies he stirred up wherever he went are reviewed.
Beyond the spectacle, the production analyze the social and political context in which Estrada operatedA Spain emerging from a long dictatorship, beginning to speak openly about sex, yet still burdened by many inherited prejudices and censorship. Her figure serves as a pretext for discussing feminism, freedom, the exploitation of image, and the risks assumed by those who place themselves at the forefront of any cultural change.
RTVE Play opts in this case for a direct tone, with juicy archival material and testimonies that help to position Susana Estrada not only as an erotic icon, but as a relevant piece within the history of sexual liberation in SpainFor anyone wanting to delve deeper into the more roguish and groundbreaking side of the transition, this is an essential documentary.
'Ruiz Mateos: the first viral phenomenon' and the power of television
With 'Ruiz Mateos: the first viral phenomenon', RTVE Play goes headfirst into the terrain where politics, money, justice and media spectacle intersectThe documentary reconstructs the figure of José María Ruiz-Mateos, founder of the Rumasa group and protagonist of one of the biggest economic-legal soap operas in contemporary Spain.
Throughout the footage, the following are reviewed His different facets: successful businessman, politician with his own party, sports leader and television personality capable of monopolizing screen time like no one elseThe piece shows how, in an era without the internet or social media, he managed to turn every public appearance into an event, exploiting the logic of showmanship even in judicial and political contexts.
A key point of the documentary is the idea of Ruiz-Mateos as a “viral phenomenon” before the term existedHis disguises, his public attacks on ministers, his phrases repeated over and over again in the media, and the massive coverage of his legal troubles created a kind of "analog meme" that millions of people followed almost in real time through television.
The production also delves into the economic and social consequences of their business dealings, the impact of the Rumasa case, and the mark it left on popular culture. The thesis that Its story is, in part, the story of how television began to shape politics and public opinion in Spainpaving the way for other characters who would later exploit the same codes.
'Roman Engineering': When history becomes spectacle
Another of RTVE's great documentary pillars is the series 'Roman engineering'a production that combines Archaeology, history, and digital recreations to teach how the Romans changed the landscape with their worksAmong all its episodes, one of the most outstanding on RTVE Play is the one focused on mining.
This particular chapter It delves into the mineral extraction techniques used by the Romans.From the use of water to level mountains to systems of galleries and tunnels, the exhibition analyzes emblematic sites on the Iberian Peninsula, showcases current archaeological remains, and explains the processes through a combination of infographics and on-site footage.
The key to the success of 'Roman Engineering' is that It manages to transform content that could be purely academic into something highly visual and entertaining.Photography, music, and 3D recreations bring the viewer closer to a world where infrastructure was a tool of political and military power, and where mining played a central role in fueling the empire's economy.
The fact that this episode made it into the most-watched episodes of the year proves that There is a large audience willing to watch historical documentaries if they are well produced.RTVE Play has taken advantage of this by offering a series that works for students, history buffs, or simply curious viewers.
'Lucía in the spider's web': Spanish true crime
For those who enjoy the true crime genre, 'Lucía en la telaraña' is one of the highlights of the RTVE Play catalogThis original documentary series delves into the disturbing case of Lucia Garrido, murdered in dark circumstances, with an investigation plagued by shadows and ramifications that still raise doubts.
Through several episodes, The series reconstructs the events from the moment of the crime to the latest developments in the case.The documentary highlights contradictions, gaps in the police investigation, and possible connections to other cases. It combines archival footage, statements, documents, and interviews with people involved in or familiar with the case.
What distinguishes 'Lucía en la telaraña' from other true crime shows is their willingness to point out structural flawsIt does not simply narrate a morbid event, but also raises the question of what happens when an investigation is not carried out with the expected rigor, how families who seek justice for years feel, and what role the media plays in keeping such a case alive.
RTVE Play here achieves a delicate balance between narrative interest and respect for the victims, offering a series that is captivating but also invites reflection on the functioning of institutionsIt's no coincidence that it slipped into the top-rated documentaries, because it has all the ingredients to captivate an audience increasingly hooked on real crime stories.
More documentaries on RTVE Play: history, science, nature and culture
Beyond these flagship titles, Each week RTVE Play puts a variety of other documentaries in the spotlight. that cover topics of nature, history, science, astronomy and cultureThe idea is that, whenever you log in, you'll always find a new and worthwhile recommendation.
Within the historical bloc, for example, There are works dedicated to figures such as Agent SicreA key figure in the political underbelly of 20th-century Spain. These documentaries typically draw on little-known archives, expert testimonies, and a very solid journalistic approach, perfect for those who want to go beyond the headlines in textbooks.
In the field of international history and geopolitics, Productions focusing on Stalin's profile stand out.These works, which examine his rise to power, the consolidation of his regime in the Soviet Union, the internal purges, and the impact he had on millions of lives, are not complacent: they attempt to offer a critical perspective, supported by documents and recent historiography, that helps to understand why his figure remains so controversial.
From the darker side of science, RTVE Play has also included Documentaries about the Scottish psychiatrist Ewen CameronKnown for his deeply questionable experiments and practices in the field of mental health, these works analyze how, under the guise of research, procedures that we would now consider clearly inhumane were carried out, and how he participated in broader programs funded by intelligence agencies during the Cold War.
In the area of culture and territory, they are particularly interesting Documentaries that investigate the impact of film shoots in Almería in the 60sThere, the arrival of major international productions transformed desert landscapes into settings for westerns and historical epics, leaving a unique economic and social imprint on the area. This book explains how the lives of its inhabitants changed, how an industry developed around these film shoots, and what remains of it all today.
Nature also has its space with Documentaries dedicated to cheetahs and the current state of their habitatThese productions focus on both the biology and behavior of these felines and the threats they face: loss of territory, conflicts with human communities, poaching, and climate change. The goal is to raise awareness about biodiversity conservation without sacrificing spectacular visuals.
Taken together, this type of content demonstrates that RTVE Play's commitment to documentaries goes far beyond a handful of famous titlesThere is a balance between prestigious international productions, original works, and themed series that can be watched independently or in a marathon, adapting to what you feel like at any given moment.
An important detail to keep in mind is that All these documentaries can be viewed online, for free and without a subscription.Simply access RTVE Play from your browser, the mobile app, or the app on your smart TV, choose the title you're interested in, and press play. It's a particularly attractive option compared to other paid platforms where similar content comes with a monthly fee.
The RTVE Play documentary catalog has become a kind of reference public video library It combines such disparate topics as the universe, the Spanish transition to democracy, Roman engineering, media phenomena, true crime, and wildlife. If you enjoy learning while watching a well-presented story, you'll have hours and hours of entertainment without spending a penny.