Dungeon, volcano, swamps with crocodiles — people are able to get in at all, it would seem, is not suitable for life areas.

 Aogashima, Japan: life on the volcano

The inhabitants of the island-volcano Aogashima so used to the constant danger that I think such things are quite natural. It may seem like a double crater, towering above the sea, few are suitable for life, but the islanders don't agree with it. Like the wilderness in densely populated Japan on the fingers can be counted. 

 Palmerston , cook Islands - the island of the same family

In 1863 on the island of Palmerston in the Pacific ocean was the Englishman William masters and three of the Tahitian. What did you do there by the first settlers is not known, but by the beginning of XX century, the number of island residents with the surname masters has risen to 134 people. Atoll, far from the nearest "mainland" New Zealand, more than 3000 kilometers, and remained an island of one family. 

  La Rinconada, Peru: into thin air

Settlement in the Andes, located at an altitude of 5100 meters above sea level, is recognized as the highest settlement in the world. Thin air, low temperatures and near-primitive conditions of existence do not stop tens of thousands of workers who come to La Rinconada in search of gold ore. 

 Pitcairn island, UK: edge of the world

You need to try very hard to in the era of high-speed ships and planes to stay more than a day journey from the nearest settlement. Pitcairn with the problem is to cope. A group of Islands lost in the Pacific ocean, away from the main commercial and tourist routes. Meanwhile, to meet local residents number just over 50 people came for four Russians as evidenced by signed notes, carefully left in a local café.