USA, Lower Antelope Canyon
Nature never stops surprising us. And the same applies for human kind.
Less than 20 years ago it was possible to enter and walk around on your own, but because certain people used to entertain themselves writing on the walls or even by shooting with guns against the walls just to hear the roar echoed in the canyon, the access was closed to public.
Nowadays these slot canyons are accessible only by joining a tour with a Navajo guide, but still very magical and worth the visit.
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Sig Nordal 