Madrasa and Mausoleum of Sultan al-Nasir Muhammad (b/w photo)

The Madrassa of Al-Nasir Muhammad (1285-1341) is a madrassa and mausoleum located in the Bayn al-Qasrayn region of Cairo, Egypt. It was built in the name of the Mamluk sultan Al-Nasir Muhammad ibn Qalawun, but its construction began in 1296 under the reign of Sultan Al-Adil Kitbugha, who was sultan in between Al-Nasir Muhammad's first and seconds reigns. The most unique aspect of the Madrassa of Al-Nasir Muhammad is its gothic marble portal, acquired from a Christian church in the city of Acre after al-Ashraf Khalil's victory against the Crusaders in 1291. After the battle Khalil appointed his emir "to destroy the city walls and demolish its churches". When the emir came upon the church with this portal as its gate he decided to transport it in its entirety back to Cairo.