A open air theatre built on a cliff by an eccentric British woman.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

A statue of Vladimir Illyich Lenin guards this abandoned building in the "Forbidden City."

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

An abandoned swimming pool decays on the outskirts of Berlin.

From Iggy Pop to David Bowie to Nick Cave, this regal music studio has served some of the all time greats.

When German-Iraqi relations broke down, this embassy was vacated post haste.

Berlin's old airport.

Super-heavy Nazi architectural experiment.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

An eerie, derelict amusement park in Berlin.

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

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Houses are tucked between, on, and underneath giant boulders.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Underground hospital complex constructed by slave laborers during the German occupation of the Channel Islands.

An intricately decorated tiny place of worship.

Enormous sandstone towers loom within a Czech forest.