Krak des Chevaliers

The rooms of the upper and lower castle were different, there were latrines, baths, and barracks, but also impressive, decorated meeting and courtrooms.

An excerpt from the article 17 facts about Krak des Chevaliers

Noteworthy is a 10 m high, 8 m wide, and 20 m long room equipped with a heating furnace and serving as the center of garrison life. One of the towers was the residence of the Grand Master. There are terraces and courtyards and many small rooms of unknown purpose.