Cave Thawr

Science museum located in the Abraj Al-Bait towers.

The holiest site in Mecca and Islam is Grand Mosque. The massive mosque is the world's largest mosque and can accommodate up to 2 million people at once. The mosque has been continuously expanded and still going through major expansion and renovation. This mosque is the focal point of the Hajj and Umrah pilgrimages.

At the center of the grand mosque is the Kaaba, which according to Muslim traditions was built by the Prophet Abraham and his son, the Prophet Ishmael. Covered in black cloth, it is circled seven times by Muslim pilgrims and it is toward the Kaaba that Muslims face in the direction while performing Islamic prayers (Salat). The Black Stone set intact into the Kaaba's eastern cornerstone wall by Muhammad himself is an Islamic relic which, according to Muslim tradition, dates back to the time of Adam and Eve. Many Muslim pilgrims while doing Tawaf try to kiss and touch the sacred stone; however, this usually requires a lot of effort because of crowding.

These were the two small hills now well transformed into long galleries which are well-constructed with marble floor and equipped with air-conditions. Muslim traditions held that Hagar, wife of Abraham, ran back and forth between these two hills in search of water of her son Ismail. It is believed that she first climbed the hill of Al-Safa and later Al-Marwah. Today Muslim perform ritual walking here called Sa'ee involves walking between the two hills seven times. Each trip requires approximately 300 m of walking and roughly 2.1 km in total.