Mainz Castle is a historical castle located in the old area of the city. It was built in 1660 AD, as it was used to defend the city and has been subjected to many attacks throughout history. Today, the castle building has been preserved as a historical and archaeological building in the city, where it is used Part of it serves as municipal offices, and the Mainz Historical Museum is also located inside, and many of its historical facilities are still intact, such as a moat.