books.google.ca - In 1972 UNESCO created the World Heritage Foundation, a program to identify and protect "world heritage sites" -irreplaceable environments ranging from natural areas to whole urban centers. To date over 600 such sites have been designated for protection on four continents, including places of worship,...http://books.google.ca/books/about/World_heritage.html?id=YIAVAQAAIAAJ&utm_source=gb-gplus-shareWorld heritage
