The Parthenon in Athens was used as a gunpowder store with predictable results for the Elgin Marbles. Almost every major city in Europe burned down in the 1600s before people decided to stop making cities made of wooden houses a few feet apart. In some fields humans are very, very slow learners, people still jump into the sea and drown every year trying to rescue their dogs who can swim and get out of the water a short time later.