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Cool caves
Hidden away deep inside Earth’s crust
is a magical subterranean world of caverns,
such as these stunning examples.
Psychedelic salt mine
A former salt mine in Yekaterinburg,
Russia, is now one of the world’s
most colorful caves. More than
650 ft (200 m) underground, its
patterned rainbow walls are caused
by the mineral carnallite swirling
in layers through the rock.
US_020_021_309600_Cool_Caves.indd 20 19/12/17 12:55 pm
