Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

Terrifying derelict military hospital once housed a recuperating Hitler.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

A Turkish ghost town abandoned in a population exchange with Greece.

A rococo retro-futurist future-rustic vernacular between yesterday’s tomorrow and the future that never was.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

Collective dedicated to restoring steam engines.

Turning night into day in Victorian-era Austin to thwart a serial killer.

An unrealized dream to wirelessly electrify the entire Earth.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

Behemoth, cannon-like telescope operated by generations of Irish earls.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

A museum within a museum, devoted to history's most questionable medical devices.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

Where the embers of the Big Bang were first detected.

Gutted airplanes slowly decay in a Florida field.

Once the most densely populated place in the world, this island is now a ghost town.

Surreal riveted sea forts once protected the Kent shores from German attack.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Ruins of a German Castle on top of a towering stone pillar.