Seattle might be the only city that can claim to be built on top of another city. After the Great Fire of 1889, citizens raised the street level and started over – you can tour parts of old Seattle thanks to the city’s Underground Tour.
Instead of relocating, most businesses decided to rebuild where they had been, and rebuilding began almost immediately. Wooden buildings were banned in the burned out district, to be replaced by brick. At the same time, streets were raised up to 22 feet in places, helping to level the hilly city. Within a year, 465 buildings had been built, most of the reconstruction was complete and the businesses had reopened.