On #WorldHeritageDay, see some of the sites under threat—both natural and man-made—and help spread the word to thwart future damage https://on.natgeo.com/2HNHBlG

On #WorldHeritageDay, see some of the sites under threat—both natural and man-made—and help spread the word to thwart future damage https://on.natgeo.com/2HNHBlG 

https://twitter.com/NatGeoTravel/status/986741239088386048