Known as the Galata Mevlevi Museum, this is an old Sufi Dervish lodge founded in the 15th century. It includes a complex with courtyard, cemetery, and the monastery, now converted into a museum of Sufism. This is one of the only places in Turkey where you can learn about the monastic order, with clothing and artifacts of the Sufi order on display. The most interesting sight is the whirling Dervish ceremony that is sometimes held here.