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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. World Heritage partnerships for conservation. 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.

  3. List of World Heritage Sites in Central America. List of World Heritage Sites in North America. List of World Heritage Sites in South America. List of World Heritage Sites in the Caribbean.