Hang Son Doong in Vietnam is the largest cave in the world. It’s more than 5.5 miles long, comes complete with its own jungle and river and is literally so gargantuan that it could apparently hold an entire block of 40-story skyscrapers within its walls. It is in fact so big that it has two complete forests and it’s own clouds inside of it. You will love this.
Featured image copyright: Photographer Simon Dunne, 2013
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