The city also has many historically and architecturally precious buildings; the Ferhat water channel, the 13th century Seljuk Burmali Mosque, the 15th century Yildirim Beyazit Mosque and Complex; the 14th century Ilhanli Bimarhane Mental Hospital with lovely relieves around its portal, the extraordinary octagonal Kapi Aga Medrese (theological school), the Torumtay Mausoleum and the Gök Medrese. There are traditional Turkish mansions which have been well-preserved showing the best examples of Turkish architecture. The 19th century Hazeranlar Mansion has been restored perfectly and now it is of great interest with an art gallery on its first floor and an ethnographical museum on the second. The Archaeological Museum of Amasya has an interesting collection including the mummies of the Ilhanli rulers of Amasya.