There's a city built on a giant sinkhole
The city of Sibiu, Romania, was partially rebuilt on top of a massive sinkhole that formed in the 17th century. The sinkhole, known as the "Large Pit," measures over 600 feet (183 meters) long and 200 feet (61 meters) wide. Despite its precarious location, Sibiu has thrived and is now a UNESCO World Heritage Site. The city's unique architecture and history have made it a popular tourist destination.