Chor Minor

Chor Minor, alternatively known as the Madrasah of Khalif Niyaz-kul, is a historic gatehouse for a now-destroyed madrasa in the historic city of Bukhara, Uzbekistan. It is located in a lane northeast of the Lyab-i Hauz complex. It is protected as a cultural heritage monument, and also it is a part of the World Heritage Site Historic Centre of Bukhara. In Persian, the name of the monument means "four minarets", referring to the building's four towers.

Source: Wikipedia