Subterranean Sites

A well-preserved network of cavernous tunnels have spent silent centuries removing Toronto's waste.

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

Scattered throughout London are ancient remnants of the city's former bounding wall.

An abandoned relic of the city's failed experiment with below ground transit.

A tunnel dug through the side of a mountain by hand provides convenient yet death-defying access to a small village in China.

A beautiful oasis town dating back to the Roman period still serves as reprieve from the brutal summer sun in Libya.

Cursed swimming pool left abandoned is now a favorite of filmmakers and ghost hunters.

Ruined castle with subterranean vaulted Goblin Ha' or "Goblin Hall."

Covering 37 subterranean acres, this Armillaria gallic is a famous fungus with its own festival.

The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California."

A historic fort commemorating the United States' naval history.

More gold than anywhere else, ever.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Gold Rush ship-turned-hotel buried underneath San Francisco's financial district.

These picturesque ruins crumble beautifully into the ocean.

Rock-cut cave complex filled with ancient Buddhist artwork.

Minnesota's oldest and deepest mine is now an underground physics laboratory.