Badshahi Mosque in the tentative list for UNESCO World Heritage Site. In 2000, the marble inlay in the main prayer hall was repaired. In 2008, replacement work on the red sandstone tiles on the mosque's large courtyard commenced, using red sandstone especially imported from the original source near Jaipur, India,[18] bringing it to be nearly restored.[19] Features[edit] The architectural plan of the mosque is similar to that of Jama Masjid, built by Aurangzeb's father Shah Jahan in Delhi.[20] It combines the functions of both a mosque and an idgah. On the eastern side of the mosque is the entrance stairway which leads through a vaulted entrance constructed of red sandstone.[21] The courtyard measures 276,000 square feet[22] and is enclosed by single-aisled arcades. At each of the four corners of the mosque, there is an octagonal, three storeyed minar of red sandstone which has an open, marble-covered canopy. The courtyard is framed by four smaller minarets. The prayer chamber has a central arched niche with five arches on either side which is about one third the size of the central niche. The largest dome is behind the central arch and on its two sides there are two bulbous marble domes. Besides the mosque has symmetry as well as balanced clarity and proportions.[21] The minarets are 196 feet tall with an outer circumference of 67 feet and the inner circumference is eight and half feet. The mosque is built on a raised platform, which is reached by a flight of 22 steps.[22] Though the rooms above the entrance gate are not open to the public, it is believed that it contains Muhammad's and his son-in-law Ali's hairs.[23] The main prayer chamber is divided into seven chambers by engraved arches. On the top of the middle, there are three domes, one main and two minor which is a common feature of Mughal architecture. The courtyard is made up of brownstone slabs. The interior of the mosque is adorned with precious and semi-precious stones in floral design. The three chambers on each side of the main chamber contains rooms which are used for teaching purpose. The mosque can accommodate 10,000 worshippers in the prayer hall and 1,00,000 worshippers in the courtyard. The courtyard is the largest amongst other mosques in the world.