Tunnels

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

These passages carved from the Antarctic ice hold strange shrines to the harsh southernmost climes.

This chimerical bridge/tunnel appears to dead end right into the sea.

She asked for a potato cellar and over the next 23 years he gave her a network of holy caves.

Legend says that this short Canadian tunnel still holds the dying screams of a girl who burned alive.

A Texas-sized particle collider that was abandoned due to its Texas-sized budget.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

This Italian foot path winds through the mountains via 52 individual tunnels.

When Croatia became independent of Yugoslavia, the splintering governments left behind these concrete tunnels.

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.