While Angkor was known to the local Khmer and was shown to European visitors; Henri Mouhot in 1860 and Anna Leonowens in 1865, it remained cloaked by the forest until the end of the 19th century. European archeologists such as Louis Delaporte and ethnologists such as Adolf Bastian visited the site and popularized the site in Europe. This eventually led to a long restoration process by French archaeologists. From 1907 to 1970, work was under the direction of the École française d'Extrême-Orient, which cleared away the forest, repaired foundations, and installed drains to protect the buildings from water damage. In addition, scholars associated with the school including George Coedès, Maurice Glaize, Paul Mus, Philippe Stern and others initiated a program of historical scholarship and interpretation that is fundamental to the current understanding of Angkor.