panels of its colourful original bas-reliefs, which were covered with cement and white paint, which is the only kind found in mosques around Malaysia. The bas-reliefs feature the natural scenery and plants of Klang District. They are coloured brightly using hues of red, yellow, blue, and green. The main prayer room Sultan Sulaiman Mosque is octagonal at the bottom, but it slowly smoothens into a circle at a height of 10 meters. The upper floors can be accessed with 'catladder'. There are decorative iron frames under the dome that support the multi-coloured patterned glass. The mosque was designed to accommodate about 1,000 pilgrims at a time. History Sultan Sulaiman Mosque was given as a gift by the British Government to then-Sultan of Selangor, Sultan Sulaiman Alaeddin Shah to commemorate the declaration of Klang as a royal town and to replace the old and unsafe Pengkalan Batu Mosque which was demolished during the construction of Klang train station. He laid the foundation stone of this mosque in 1932. According to history, before the building of the mosque commenced, a groundbreaking, qibla determination, and prayer ceremony was performed. This ceremony, attended by royalties, government officials, religious figures, architects and British officers, amongst others, was held in order to accurately pinpoint the position of qibla, or the direction towards the Kaaba in the Sacred Mosque in Mecca. The method used was through observing the shadows cast by vertical objects. The mosque was officiated on 23 June 1933 by the Sultan, during a ceremony attended by the public as well as some prominent guests including the Raja Muda of Selangor, TS Adams (The British Resident of Selangor), L. Kesteven (the architect of the mosque), Raja Haji Othman (Chief Kadhi) besides various Malay chiefs, religious officers and European officials. During its opening, the mosque was reportedly the largest mosque in the then-Federated Malay States. Originally, this mosque was known as Masjid Suleiman Jamiur Rahman and it served as Selangor's state mosque until the completion of Sultan Salahuddin Abdul Aziz Mosque in Shah Alam in 1988. The Sultan Sulaiman Mosque remained as the royal mosque. In May 2012, the mosque was declared a National Heritage Building under the National Heritage Act 2005 (Act 645). The building underwent a number of upgrades and renovations in 1933, 1949, 1953-54, 1958, 1966, 1968, 1970s, 1980s, 1990s and 2000s. Between March 2015 and October 2017, the mosque was closed to