Subterranean Sites

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

This underground museum highlights the history of Mexico City's subway system.

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

A 2,000-year-old engineering wonder hides beneath an Italian town.

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.

The spectacular subterranean collection includes dazzling minerals, including a piece of "kryptonite."

Replicas of fossils unearthed during renovation work reveal how this area would have looked millions of years ago.

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

A relic of Victorian grandeur hides beneath a busy South London road.

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

This peculiar Italian elevator runs both horizontally and vertically.

Home of a 28-foot tall stalagmite known as the War Club.

A subterranean relic of the Spanish Civil War hides below this picturesque park.

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.

An enchanting natural wonder in Puerto Rico's Camuy River Park.