Closed cities: 33 photos of secret human settlements on the planet

In many corners of the world, there are hidden settlements, artificial agglomerations, or strategic facilities. Most often, these are raw material mines or military bases, refugee camps, or settlements of the richest people on Earth. And here are some of those that photographer Gregor Sailel captured.
Foto 1

Diamond mine “Mir” Republic of Sakha (Yakutia).