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Krubera Cave (deepest cave in the world) in the Western Caucasus

from Foursquare

Vườn Quốc Gia Phong Nha-Kẻ Bàng (Phong Nha-Ke Bang National Park)

Hang-en cave, Vietnam - a magical place.

from The Huffington Post

They Didn't Even Know This Existed

Viet Nam. Son Doong Cave | Scientists have discovered never-before-seen plant species around Son Doong's waterfalls. Oh, and there's a whole river in there, too.

Petra, Jordan. Light rays in the caves.

Waimanu Valley, Kauai || even though I live on O'ahu still want to voyage here {cw}