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.
Toompea Castle
Toompea Castle () () is a castle on Toompea hill in the central part of Tallinn, the capital of Estonia. The castle, an ancient stronghold site in use since at least the 9th century, today houses the Parliament of Estonia.