A national collection of Communist-era musical posters.

Warsaw's fantastically preserved gasworks...almost.

Hundreds of unusual wheel crosses poke above the earth in this small Estonian cemetery.

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

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

A wooden replica of France's famous tower.

Mysterious craters may have been home to an ancient cult.

An abandoned masterpiece of Soviet Brutalist architecture.

A narrow strip of land is home to the tallest migrating dunes in Europe.

Ever-growing collection of devils in art.

A curious art park at the geographic center of Europe is home to 3,000 television sets and other wonders.

3,000 market stands in five former Zeppelin hangars.

A vast and unlikely aviation museum kept alive for over 50 years due to one man's tenacity.

Villas that once served as playgrounds for the rich now fall away in decay.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

One of the largest barracks of the Austro-Hungarian monarchy's military is now an abandoned ruin.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

The bizarre rocks of Đavolja Varoš are the result of natural erosion.

A misnamed well, with a deep dark past.

This huge metal monument is slowly being stripped to its concrete skeleton.

This surreal memorial/cemetery is a necropolis of crumbling stonework and puzzle-shaped headstones.

An abandoned saucer-shaped monument in the Bulgarian mountains.

Space-age monument to an early 20th-century uprising.