The Late Bronze Age Collapse
Sometime around 1200 B.C., the entirety of the Eastern Mediterranean, Anatolia, and Aegean region suddenly collapsed. All cities were destroyed and the Dark Ages began. It is unclear as to what caused the collapse, but evidence points toward a variety of reasons, such as climate change, drought, famine, earthquakes, invasions, and internal rebellions.
Mohenjo Daro
This UNESCO World Heritage Site was once home to an ancient civilization that emerged around 4,500 years ago. Mohenjo Daro was discovered in 1911, and excavations didn't begin for a decade. The city was equipped with advanced drainage systems and grid-style construction, but the fate of its inhabitants remains a mystery.