Twisted buildings adorn the banks of the Rhine river.

The elegant structure of this 19th century railroad bridge creates an illusion of infinity.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

The world's oldest model village.

Theme park featuring miniature replicas of European monuments.

Climb inside an iron crystal magnified 165 billion times its normal size.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This attraction was abandoned after the Chernobyl disaster.

This derelict superstructure was a very important warning system for the Soviet military.

Austria's very first and only nuclear power station was completed but never used.

This abandoned fighter jet launch center is now a haunting street racing course.

Despite being tiny and rural this Georgian airport looks like a sci-fi boondoggle.

This dark, damp, perilous tunnel is the only passage from north to south Tajikistan.

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

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

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

These crumbling Latvian forts make for some haunting seaside ruins.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

These abandoned coal mine towers near Sherwood Forest might soon boast the U.K.’s longest zip-line.

A pair of connected skyscrapers form this symbolic gateway.

These half-buried combine harvesters just off Route 66 are an homage to the Cadillac Ranch.