By Nick Visser, Source: The Huffington Post

These photos were taken deep underground within the miles of abandoned mines beneath Yekaterinburg, Russia. Layers of carnallite — a mineral used in fertilizers — band the tunnel walls, producing these technicolor masterpieces. Think a subterranean version of China’s stunning rainbow mountains.

A small portion of the carnallite mines remain in use, but most of the passageways are now closed and off-limits to the public without a special government permit, according to photographer Mikhail Mishainik. Take a look at a few more photos of the caves below.

See more at: The Huffington Post