Sacred Relics (Topkapı Palace)
The various relics of Muhammad, his followers, and other items purportedly associated with Muhammad were brought to Topkapı Palace in Istanbul, where they remain to this day.
Topkapı Palace
The square Tower of the Head Tutor ("Başlala Kulesi"), also known as the Chamber of the Chief Physician and court drugstore ("Hekimbaşı Odası ve ilk eczane"), dates from the 15th century, and is the oldest building in the Fourth Courtyard. It was built as a watch tower, probably during the time of Mehmed II. It has few windows, and its walls are almost two metres thick. The physician had his private chamber at the top, while below was a store for drugs and medicine.