Tunnels

A labyrinthine underworld of tunnels and caverns hides beneath the city.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

The site of one of the largest prison escapes of World War II.

The blowhole bursts spectacularly right next to the buildings in a medieval seaside town.

This old train trestle and collapsed tunnel once allowed the railroad to negotiate the steep slopes of the Colorado Rockies.

This subterranean passage reveals the city's mining history as well as its legendary terrors.

An abandoned, desolate train tunnel that was used during World War II.

This peculiar Italian elevator runs both horizontally and vertically.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

Canada's oldest railway tunnel is illuminated in a rainbow of color as it passes under the streets of this small city.

The tombstone of an unfortunate explorer who disappeared in the Paris Catacombs.

This nondescript building hides an entrance to an underground nuclear tunnel system.

This Gothic castle-like portal is a testament to the amazing craftsmanship of the navvies who built the railway tunnel.

Abandoned for over a century, this chilling train tunnel is now a destination for ghost hunters.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

A mysterious set of tunnels carved in the hills of rural northern Kyushu.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.