Arsenalsnaya, the deepest metro station on the world

North Sentinel Island and its completely isolated tribe

Oymyakon, the coldest town on earth

Chernobyl, the nuclear disaster that is now a tourist attraction

Svalbard, a vault containing seeds for every plant in the world

Whittier, the town where everyone lives in the same building

Monaco, where one out of three people is a millionaire

Uzupis, the self-proclaimed republic in Lithuania