Ellison's Cave(en.wikipedia.org)
30 points by dataminer | 19 comments
First screen, captured .
Looks similar
Bunkers in Albania(en.wikipedia.org)
193 points by samclemens | 144 comments
Santa Susana Field Laboratory(en.wikipedia.org)
22 points by rbanffy | 5 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
Blue iceberg(en.wikipedia.org)
74 points by thunderbong | 11 comments