Subterranean Sites

Colorful lights and mirror-like brine pools create trippy illusions within the historic mine.

The secret room where early Bolsheviks cranked out propaganda fliers on a smuggled printing press.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

An ancient underground cultic temple where sunlight penetrates on the summer solstice.

The wartime boat shelter now doubles as an underground concert hall where musicians play on rafts along the waterway.

The hellish conditions of this abandoned mine that snakes beneath the Pacific Ocean gave it its diabolic name.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

Some locals believe the fabled lost gold of General Yamashida is hiding somewhere beneath the city.

Locals visit this abandoned train tunnel where a man took his own life to ask favors of his spirit.

An abandoned railroad tunnel forgotten by time awaits inquisitive hikers.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

Travel through the hidden underbelly of the city in colorful tunnels filled with art and history exhibits.

The subterranean sanctuary home to local shamans is a sacred site for people of all religions.