Al-Masjid al-Nabawī: "Mosque of the Prophet"), often called the Prophet's Mosque, is a mosque built by the Islamic Prophet Muhammad(pbuh) situated in the city of Medina. It is the second holiest site in Islam (the first being the Masjid al-Haram in Mecca). It was the second mosque built in history and one of the largest mosques in the world. At present,the mosque enclosure is 100 times bigger than the first mosque built by Muhammad(pbuh) and can accommodate more than half a million worshippers. The mosque has a flat paved roof topped with 27 domes on square bases. Holes pierced into the base of each dome illuminate the interior. The roof is also used for prayer during peak times,when the domes slide out on metal tracks to shade areas of the roof, creating light wells for the prayer hall. At these times, the courtyard of the Ottoman mosque is also shaded with umbrellas affixed to freestanding columns. The roof is accessed by stairs and escalators. The paved area around the mosque is also used for prayer, equipped with umbrella tents. The mosque is lavishly decorated with polychrome marble and stones. The columns are of white marble with brass capitals supporting slightly pointed arches, built of black and white stones. The column pedestals have ventilation grills that regulate the temperature inside the prayer hall. This new mosque contains the older mosque within it. The two sections can be easily distinguished: the older section has many colorful decorations and numerous small pillars, and fans have been installed in the ceiling; the new section is in gleaming white marble and is completely air-conditioned. The open courtyard of the mosque can be shaded by folded, umbrella-like canopies, designed by Bodo Rasch and Buro Happold.