Ten abandoned cities:
http://www.gadling.com/2011/04/27/the-worlds-ten-creepiest-abandoned-citiesGadling does a poor job explaining some of these, so I'll fill in the gaps!
Pripyat, of course, is well known. But Sanzhi was new to me. Gadling says:
This area called Sanzhi was originally a vacation resort catering to U.S. servicemen north of Taipei. The architecture could be called UFO futuro chic, and the abandoned resort community had difficulties from the beginning. During construction, many workers perished in car accidents, and other freak accidents were common. The urban legend online search trail places the death count close to twenty. The deaths were attributed to supernatural causes. Some speculated that the resort was built on a Dutch burial ground while others attributed the misfortunes to a dragon statue destroyed during construction. Either way, the ruins never took their first guest, and the stillborn project was abandoned.
More at Wiki:
http://en.wikipedia.org/wiki/Sanzhi_UFO_housesThere's videos and photo links at that article. My impression is that this is less a "city" and more a group of vacation homes circling a small lake.
Craco sounds awesome!
http://en.wikipedia.org/wiki/CracoKolmanskop:
http://en.wikipedia.org/wiki/KolmanskopHashima Island:
http://en.wikipedia.org/wiki/Hashima_IslandSite of Battle Royale II. It's where the first picture on the Gadling article comes from:

Oradour-sur-Glane is more memorial than anything else, and isn't an intentionally abandoned city like the others. So a little unfair sticking it on the list since a visit there is roughly on par with a visit to Auschwitz and so on.
Centralia is well known, as well. And, as they admit, not technically abandoned. Remarkably.
Humberstone -- another bad addition to this list. One of many abandoned mining towns around the world (the town beneath the bridge at New River Gorge should get mentioned if they're going to throw in glorified mining camps). Though Humberstone has a good story to tell since Pinochet converted it into a concentration camp.
http://en.wikipedia.org/wiki/Humberstone_and_Santa_Laura_Saltpeter_WorksThe same goes for Bodie. Western ghost towns. Yawn.
Kyakol, though, looks pretty fun.
http://en.wikipedia.org/wiki/Kayak%C3%B6y