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Why the Colosseum was built on top of a lake
The Colosseum was built on top of a lake. An emperor's private lake. Look where it sits: in a valley, between three hills. Almost two thousand years ago, this whole valley was underwater. And that lake wasn't natural. It was dug for one man. The emperor Nero. In 64 AD, a fire burned through Rome for six days, and wiped out a huge part of the city. Nero didn't give that land back. He took it, and built himself a palace across three hills: the Golden House. And right in the middle, his own private lake. Romans hated it. Four years later, Nero was dead. After a year of chaos, a general named Vespasian took over, and he wanted everyone to see things had changed. So he drained Nero's lake, and right on top of it, he built the biggest amphitheatre in the world. For the people. Tens of thousands of Romans came here to watch the games, right on top of Nero's lake. If you go, head up to the second level and picture the water that was here first.
Sources: Suetonius, The Life of Nero · Tacitus, Annals, book 15