I've always found Varosha in Cyprus quite interesting. Due to the fact that no-one can decide which half of the island the city belongs to it's been fenced off for about 30 years with no-one allowed in
Also Centralia in the states. In the 1960s a fire started in an underground coal mine, the ground became so unstable (and hot) that the town had to be abandoned. The fire's still burning today and they predict it will do for the next 250 years.
Surely its one quarter of the city is Famagusta, not simply Varosha? Ive been inside: much to my girlfriends concern (only a little bit though: I didnt saunter through the streets or anything). If you circumnavigate the perimeter youll find some shockingly poor areas: it was like the West Bank! The 'keep out or we will shoot you' signs will fit perfectly in your suitcase btw.