Ten Lost Cities of the World

From Forbes

1.  Petra, Jordan
2.  Chichen Itza, Mexico
3.  Deinkuyu Underground City, Turkey
4.  Machu Picchu, Peru
5.  Angkor, Cambodia

6.  Pre-Roman Carthage, Tunisia
7.  Pompeii, Italy
8.  Memphis, Egypt
9.  Teotihuacan, Mexico
10.  Mosque City of Bayerhal, Bangladesh

I've heard of all but #3 and #10.

Usually Lost, Anyway.  --Cooter