Mark Sanders
Subterraria
info
under—Jewel Cave, SD
2018
in series
Tags
national monument
midwest
underground
geology
cave
spelunking
claustrophobia
subterranean
erosion
landscape
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info
Lidenbrock Sea
2017
in series
Tags
cavern
stalagmite
stalagtite
underground
spelunking
claustrophobia
reflection
tourist attraction
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