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  1. There are 25 World Heritage Sites in the United States; 21 are single location sites, and 4 are multi-part sites encompassing several locations (the Frank Lloyd Wright buildings, the only site with widely spaced properties, are in blue).

  2. There are 25 World Heritage Sites in the United States, with a further 18 on the tentative list. The first sites in the United States added to the list were Mesa Verde National Park and Yellowstone National Park, both at the second session of the World Heritage Committee, held in Washington, D.C., in 1978.

  3. Ensuring that World Heritage sites sustain their outstanding universal value is an increasingly challenging mission in today’s complex world, where sites are vulnerable to the effects of uncontrolled urban development, unsustainable tourism practices, neglect, natural calamities, pollution, political instability, and conflict.

  4. World Heritage List reaches 1000 sites with inscription of Okavango Delta in Botswana