The Dome of the Rock is an Islamic shrine and major landmark located on the Temple Mount in Jerusalem. It was completed in 691-692, making it the oldest existing Islamic building in the world. The site's significance stems from the religious beliefs regarding the rock, known as the Foundation Stone, at its heart. According to Islamic tradition, the rock is the spot from where Muhammad ascended to Heaven accompanied by the angel Gabriel. The Foundation Stone is the holiest site in Judaism. Just as Muslims pray towards the Kaaba at Mecca, the holiest site in Islam, Jews pray towards the Foundation Stone. Jews have traditionally regarded the location of the stone as the holiest spot on Earth, the site of the Holy of Holies during the Temple Period.