A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

This East German military command bunker was ready for World War III.

In the land of the Light Brigade stands a testament to the Cold War.

A Cold War command center is hidden under an idyllic countryside.

This top-secret nuclear bunker hidden in a Bosnian mountain has been converted to a modern art exhibition space.

These former Cold War launch sites have been preserved for tourists to see where the button might have been pushed.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

This Cold War–era underground city includes offices for Mao Zedong and Lin Biao.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

Part of a secret 1970s nuclear defense program is now open to the public.

This disused Cold War bunker has been restored to all of its early 60s glory.

The only remaining Cold War–era Minuteman II missile control center in Missouri.

This Cold War–era fallout shelter was actually a storage facility for the nation's emergency currency.

A southern Swedish island is home to the last ERSTA artillery battery, meant to protect the shoreline during the Cold War.

A former special storage facility for documents during the Cold War.

Canada's subterranean Cold War museum has doubled as a movie set.

This museum sits on the site of a decommissioned military communications base.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

A top secret Cold War bunker hidden beneath a Latvian spa facility is now open for tours.