" 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��

The hotel has its own wildlife biologist and photographer, Tenley Thompson, who created the programme and trained a team of naturalists to take small groups (with at least one guide for every five hotel guests) on customised wildlife safari tours through Bridger Teton National Forest, Grand Teton National Park and the National Elk Refuge.

BBC: The best of the West in Jackson Hole

Almost all of Bonito's tours need to be booked through an official tourist agency in the town and require an accredited guide, although this is organised at the time of booking.

BBC: Livin�� la vida Bonito