Bunkers

These Bullet-scarred bunkers are haunting reminders of the Spanish Civil War.

The wilderness of northern Sweden is full of shelters to protect people from sounding rockets returning from space.

During World War II, the Nazis repurposed this beer cellar to store stolen artwork.

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

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

An abandoned underground bunker not far from downtown New Orleans.

The grand complex of buildings that comprise Liverpool's Exchange Flags includes a vast World War II bunker that has been frozen in time.

These old World War II fortifications have been transformed into an unusual equine attraction.

These underground shelters dug by the Japanese during World War II later helped Timor-Leste achieve its independence.

Several of these strange cone-shaped bunkers can still be seen around the former Nazi headquarters.

Built on a medieval synagogue, this church has a burial crypt, tunnel system, and Jewish ritual bath hiding deep underneath.

The secret wartime bunker built on the platforms of an abandoned Tube station.

The mile-long pier stretches from a ruined fortress out into the Baltic.

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

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

This extensive nuclear fallout shelter built from 42 school buses could house 500 people in its tunnels.