When the first hunter-gatherers climbed into the alpine reaches of what is now Aigüestortes i Estany de Sant Maurici National Park 10,000 years ago, they left behind traces that would one day tell a remarkable story—one of resilience, adaptation, and unbroken connection to the high Pyrenees. At the Obagues de Ratera rock shelter, perched at 2,320 meters above sea level, evidence reveals continuous human presence from the Mesolithic era all the way through to the 20th century, a rare and extraordinary timeline in European archaeology. This revelation comes from a groundbreaking open database compiled by researchers from the Universitat Autònoma de Barcelona (UAB), who analyzed 124 radiocarbon-dated samples from 45 sites across the park, documenting 380 archaeological locations in total. For the first time, a systematic series of absolute dates has been published for a high-mountain region of the Pyrenees, offering an unprecedented window into how humans not only survived but thrived in these rugged, often unforgiving landscapes.
The significance of this work extends far beyond academic circles. By making the data openly accessible—including lab reports, sample types, site contexts, and analysis code—the team has laid the foundation for future research and replication. The findings confirm that high-altitude zones, once assumed to be marginal or seasonally used, were in fact home to sustained human activity for over 10,000 years. Three sites in particular stand out: Obagues de Ratera, with its 10,000-year span; Cova del Sardo, occupied for 7,500 years; and Portarró rock shelter, where people lived 7,300 years ago. At Portarró, archaeologists uncovered the oldest known stone architecture in the Pyrenees—dry-stone foundations with wooden elements dating back 5,000 years—proof of sophisticated construction in prehistoric times.
Periods of intensified activity align with pivotal moments in human history. Around 5,300 years ago—the same time Ötzi the Iceman crossed the Tisenjoch glacier—human presence in the park surged during the late Neolithic. Later peaks occurred in late antiquity and the early medieval period, including Visigothic-era occupation at Obagues de Ratera. These patterns challenge long-held assumptions about seasonal transhumance, suggesting instead deep-rooted, year-round habitation. As Ermengol Gassiot of the High Mountain Archaeology Group (GAAM) notes, "The sites located in high-mountain areas, places which for us would be inaccessible and inhospitable, often present long periods of human occupation."
This 20-year research project, led by Gassiot and colleagues, not only validates decades of fieldwork with robust statistical analysis but also redefines our understanding of human resilience. The Pyrenees were not a frontier to be crossed—they were a home, continuously lived in, shaped, and remembered across millennia. As climate change reshapes these ancient landscapes, the stories embedded in their soil grow ever more vital.