mysticplaces: mysticplaces: Carsten Peter, Hang Son Doong, 2011 At a mammoth 2.5 miles long, 330ft wide and almost 800ft high, Hang Son Doong also known as Mountain River Cave, is as high as 25 double decker buses. …Well, I guess someone found D’ni.
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original: https://hobomechanist.tumblr.com/post/41484535044