Himeji Castle
This castle is a World Heritage Site and a Japanese castle masterpiece. The main keep, built by Ikeda Terumasa in the early Edo period, has a five-story exterior, one basement level, and six stories above ground on the inside, making it the largest Edo period castle tower still standing.
It's truly amazing that Himeji Castle has survived wars, earthquakes, and air raids and is still so well preserved today.