A sculpture park of the tossed aside relics of the USSR, from Stalin to a massive Soviet emblem.

Moscow's most popular cemetery includes the graves of numerous cosmonauts.

A fifth-century temple improbably built into the side of a cliff.

Museum celebrating the achievements of the Soviet space program.

Stalinist skyscraper built with help of cryotechnology.

Former headquarters of the KGB.

Cliffside houses provide a spectacular view from their perch above the valley.

Now a pile of ruins and rubble, this was a lovely mountain town as recently as 1960.

This chest hospital with a dark, haunted past serves as a fitting set for horror films and a paradise for ghost hunters.

This ancient Spanish castle sits high upon a hilltop.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

Abandoned Nazi train station turned underground astroparticle laboratory.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

An unrealized dream to wirelessly electrify the entire Earth.

A formerly abandoned mental institute, now back in business.

The loneliest island in New York.

A tiny islet just off Long Island offers a wealth of infectious curiosities.

One of the oldest Jewish cemeteries in the city, it is now overgrown with an urban forest.

A defunct all-girls college which may be the resting place of H.P. Lovecraft's real-life Necronomicon.

The oldest continuously inhabited street in America.

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

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

This derelict building used to house infirm Freemasons, their widows, and orphans.