Japanese Castles in Japanese history
- Many Japanese castles were built or renovated during the Sengoku period.
 - They usually have a moat to prevent the enemy to infiltrate by tunnels.
 - There are loopholes for guns and arrows (Himeji castle has more than 1000 loopholes).
 - They have a main gate used to trick the enemy. There are usually traps around the main gate.
 - Sometimes the number of floors are tricky (Matsuyama castle has 6 floors but looks like 5 from the outside).
 - There are hidden corridors, and confusing mazes that make it difficult to locate the commanding room such as the UNESCO world heritage site Himeji Castle.
 - Nijo Castle in Kyoto has nightingale floors that squeak to make sure the ninjas cannot raid in the middle of the night while people are sleeping.
 - Kumomoto castle has many fruit trees inside so that people can feed themselves by the fruits during a siege.
 - Azuchi castle was built on the top of a steep hill with a separate tower inside so that the residents could see the approaching groups from dozens of kilometers away.
 - Each castle had an official drum (taiko) beater samurai to tell the time.
 - It takes years to build a castle but according to a story Hideyoshi Toyotomi built the Sunomata castle overnight by using pre fabric walls.
 
 Himeji Castle, by Hiroshige (1860)