It's said to look like the lips of a beautiful seductress. Or a slice of cantaloupe. But most agree it resembles a crescent moon that's fallen from the sky. It's none of these things of course, but Crescent Lake near Dunhuang, China, is a natural wonder.
Surrounded by Echoing-Sand Mountain, Crescent Spring has been gurgling up through the sand dunes of the Gobi Desert for thousands of years. Sand blows around it but has never managed to smother it, though the size of the lake has shrunk over the years.
Not surprisingly it's a destination for sand sliding and dune surfing, as well as 4x4 and camel riding.