Archaeologists in Romania have uncovered one of the world's oldest known megastructures, a massive communal building dating to around 4000 B.C.E. The oak-floor building was located at the entrance to a settlement called Stăuceni-Holm in Romania’s Botoșani County, a site first identified in the 1960s but not excavated until 2023. It belongs to the Cucuteni-Trypillia culture, a culture that spread across modern-day Romania, Moldova, and Ukraine from roughly 4800 to 3000 B. C.E., the structure is only the sixth megastructure from this culture ever found and radiocarbon dating indicates it was one of its earliest examples on record. Despite only a quarter of the site has been excavated, researchers expect the building to reveal much more about how early European communities lived and governed themselves.