Göbekli Tepe (1990s)

Discovered in the 1990s in Turkey, Göbekli Tepe is the world's oldest known temple complex, dating to around 9600 BCE. This Neolithic site features massive carved stone pillars arranged in circles, decorated with elaborate animal reliefs. Its existence forces a rethink of human history, suggesting that organized religion and complex society may have preceded agriculture, not the other way around. It fundamentally challenges our timeline of civilization's development.