The Sacred Mosque, is the largest mosque in the world. Located in the city of Mecca, it surrounds the Kaaba, the place which Muslims turn towards while offering daily prayers and is considered to be the holiest place on Earth by Muslims. The current structure covers an area of 356,800 square meters including the outdoor and indoor praying spaces and can accommodate up to 4 million worshippers during the Hajj period.Islamic tradition holds that the mosque was first built by the angels before the creation of mankind. The Black Stone is situated near the eastern corner of the Kaaba, and according to some people is believed to have 'fallen from heaven' and turned black due to man's misdeeds.