occasion of the 2nd Islamic Summit held at Lahore on 22 February 1974, thirty-nine heads of Muslim states offered their Friday prayers in the Badshahi Mosque, including, among others, Zulfiqar Ali Bhutto of Pakistan, Faisal of Saudi Arabia, Muammar Gaddafi, Yasser Arafat, and Sabah III Al-Salim Al-Sabah of Kuwait. In 1993, the Badshahi Mosque in a tentative list as a 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 was begun using red sandstone imported from the original Mughal source near Jaipur, in the Indian state of Rajasthan. Architecture As a gateway to the west, and Persia in particular, Lahore had a strong regional style which was heavily influenced by Persian architectural styles. Earlier mosques, such as the Wazir Khan Mosque, were adorned in intricate kashi kari, or Kashan style tile work, from which the Badshahi Mosque would depart. Aurangzeb chose an architectural plan similar to that of Shah Jehan's choice for the Jama Masjid in Delhi, though built the Badshahi mosque on a much larger scale. Both mosques feature red sandstone with white marble inlay, which is a departure from typical mosque design in Lahore, in which decoration is done by means of intricate tile work. Entryway of the complex Entrance to the mosque complex is via a two-storey edifice built of red sandstone which is elaborately decorated with framed and carved paneling on ea of its facades. The edifice features a muqarna, an architectural feature from the Middle East that was first introduced into Mughal architecture with construction of the nearby and ornate Wazir Khan Mosque. The mosque's full name "Masjid Abul Zafar Muhy-ud-Din Mohammad Alamgir Badshah Ghazi" is written in inlaid marble above the vaulted entrance. The mosque's gateway faces east towards the Alamgiri Gate of the Lahore Fort, which was also commissioned by Aurangzeb. The massive entrance and mosque are situated on a plinth, which is ascended by a flight of 22 steps at the mosque's main gate which. The gateway itself contains several chambers which are not accessible to the public. Courtyard After passing through the massive gate, an expansive sandstone paved courtyard spreads over an area of 276,000 square feet, and which can accommodate 100,000 worshipers when functioning as an Idgah. The courtyard is enclosed by single-aisled arcades. Prayer hall The main edifice