During the 15th century, nearly all of Angkor was abandoned after Siamese attacks. The exception was Angkor Wat, which remained a shrine for Buddhist pilgrims. The great city and temples remained largely cloaked by the forest until the late 19th century when French archaeologists began a long restoration process. France established the Angkor Conservancy in 1908 to direct restoration of the Angkor complex. For the next 64 years, the conservancy worked to clear away the forest, repair foundations, and install drains to protect the buildings from their most insidious enemy: water. After 1953, the conservancy became a joint project of the French and Cambodian Governments. Some temples were carefully taken apart stone by stone and reassembled on concrete foundations. Tourism is now the second-largest foreign currency earner in Cambodia's economy, and Angkor Wat has helped attract international tourism to the country.