" Iceland is probably one of the best places to see the northern lights, " said Reykjavik tour guide Arni Magnusson of AM Tours.

CNN: 'Dancing lights' draw thousands to frozen north

"I remember when only a handful of people came, " says Tran Hong Chi, a guide for the somewhat grisly tours into the Demilitarized Zone or DMZ, a heavily bombed and severely poisoned territory that served as the boundary between north and south Vietnam.

CNN: Stops and Starts

Local companies such as Guide Horizon run Jeep and desert buggy tours circling the rim of the crater, complete with meals and lodge-style accommodation.

BBC: Israel's mysterious ��Grand Canyon��