The Black Stone (calle الحجر الأسود al-Hajar-ul-Aswad in Arabic) is a Muslim object of reverence, which according to Islamic tradition dates back to the time of Adam and Eve. It is the eastern cornerstone of the Kaaba, the ancient sacred stone building towards which Muslims pray, in the center of the Grand Mosque in Mecca, Saudi Arabia. The Stone is roughly 30 cm (12 in.) in diameter, and 1.5 meters (5 ft.) above the ground.