Museo Comunitario El Fósil, near Villa de Leyva, is a small community-run museum built around an extraordinary attraction: the in-situ skeleton of Monquirasaurus boyacensis, a gigantic Cretaceous marine reptile found exactly where the building now stands. Around this spectacular fossil, the museum opens a window onto deep time, showing how the region was once covered by the warm, shallow Paja Sea and how layers of sediment slowly turned ancient life into stone. Inside, clear displays guide visitors through the geological time scale, the process of fossilization, and the rich marine ecosystem that thrived here over 100 million years ago, from pliosaurs to ammonites. Exhibits also touch on the first human communities to reach the Cundiboyacense Plateau, linking prehistory beneath the waves to the earliest peoples on land. Intimate and educational, the museum offers an accessible introduction to paleontology, rooted in the local landscape and community pride.