Locations deemed World Heritage sites are of "outstanding universal value to humanity" and should be "protected for future generations to appreciate and enjoy," according to Unesco. The ...

n 1973, when the U.S. became the first country to sign the World Heritage Convention, the idea was for global recognition to encourage protection of the world's great natural and cultural sites.

NASA Every two years, the nonprofit World Monuments Fund releases a list of cultural heritage sites it deems most at risk of disappearing because of threats like war or climate change. The line-up ...