Ellison's Cave(en.wikipedia.org)
30 points by dataminer | 19 comments
First screen, captured .
Looks similar
Snottite(en.wikipedia.org)
43 points by hkopp | 6 comments
Iceland Spar(en.wikipedia.org)
19 points by Thevet | 2 comments
Darvaza Gas Crater(en.wikipedia.org)
102 points by thunderbong | 22 comments
Tunnel of Eupalinos(en.wikipedia.org)
173 points by Thevet | 27 comments
Artificio de Juanelo(en.wikipedia.org)
86 points by benbreen | 10 comments