There is also a "pyatthat" over the Great Audience Hall. Due to the tropical climate, frequent renovations of the wood-and=stucco palace have been necessary; some of its original teak has been reinforced with concrete. Stucco, introduced during the Bagan period, is strongly tied to Mon heritage. Wood carving in Myanmar is a traditional art which has survived for centuries. Due to its tropical climate (necessitating the reconstruction of many buildings), the craft has been passed down from generation to generation. Without these renovations, the art of wood carving would have been lost and it would have been impossible to reconstruct traditional features. Gold cladding is a feature of traditional Burmese architecture, usually prominent in gilded or gold-plated exteriors. The Bupaya, Shwedagon, Shwezigon and Lawkananda Pagodas have gold features. During World War II, many historical structures were lost or damaged; much of the Mandalay Palace was destroyed in a fire near the end of the war. In 1962, on alleged orders from Ne Win, the Rangoon University Students' Union was demolished (although the main campus still contains lecture and residence halls from the colonial period). Since the late 1980s, many colonial structures (including a block of cinemas) have been razed for new construction. Only a few colonial-era buildings and about 2,200 temples and pagodas remain in Myanmar. As a result of these losses, many groups have united to preserve the remaining structures. The Yangon City Development Committee, established in 1990, has worked with the State Peace and Development Council to recondition many Buddhist monuments with plans for newer and more-challenging designs. Pagodas and temples have been renovated to promote "monumental Buddhism", the renewal of Buddhist architecture for a sense of authenticity. These newer Buddhist sites, a combination of modern and traditional Burmese style, are found throughout Myanmar and include monasteries, pagodas and the International Theravada Buddhist Missionary University. The crown umbrella atop the Shwedagon Pagoda, which was donated by King Mindon in 1871, was replaced in the spring of 1999. The Yangon Heritage Trust, formed in 2012, is a non-governmental organization committed to preserving Yangon's historic architecture. The trust has had several preservation successes, due to its public-awareness campaigns. Agreements with government officials have saved the former Indian and U.S. Embassy buildings and Gandhi Hall.