The Dome of the Rock is the most famous Islamic site in Jerusalem. It is not a mosque, but a Muslim shrine. Like the Ka'ba in Mecca, it is built over a sacred stone. This stone is believed to be the place from which the Prophet Muhammad ascended into heaven during his Night Journey to heaven. The Dome of the Rock is the oldest Islamic monument that stands today. It also boasts the oldest surviving mihrab (niche indicating the direction of Mecca) in the world.