Subterranean Sites

An unrealized dream to wirelessly electrify the entire Earth.

Ancient rock-hewn town that witnessed key events of Georgian history.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

Stalactites and stalagmites in a beautifully lit cave.

A unique underground structure dating back to the 1st century BC.

Underground monastery and fortress.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

An underground city of salt.

An exquisite tunnel of cascading flowers.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

An impressive home made of stone, carved more than a century ago.

The strange, ritualistic-seeming 100+ year old basement of a New Hampshire undergrad society.

A cave's rare beauty held a cavernous secret hidden underground.

Rock-cut chamber at top of an outcroup, reached by a mountain stairway of forty steps.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

Highly unusual subterranean stupa and adjacent cave monastery.