Lava Beds National Monument
The lava tubes here make for some great amateur...
by carpfish
Carlsbad Caverns National Park
Spelunking!
by aweissfeld
Kartchner Caverns State Park
Spelunking!
by aweissfeld
Gouffre de Padirac (cave in France)
We took a field trip here when I was studying i...
by kchristieh
Caving near Villahermosa
Taco, Theo, Scott, Michelle, Andrew and others ...
by anselm
Abandoned factory
An abandoned factory, soon to be torn down and ...
by bdolan2000
Faces
Abandoned nightclub
by bdolan2000