A former ironworks that was the first UNESCO industrial site.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

An amusement park on the grounds of an unused nuclear power plant, with a swing ride inside the cooling tower.

Invisible bridge parts the waters, invoking biblical images and preserving the ominous feel of an ancient moat.

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

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

The Rozenberg wind wall in South Holland makes for smooth sailing through the Calandbrug canal.

This unattributed sculpture in Amsterdam is hiding in plain sight.

A grassy pyramid named after a French battle.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

This ghost town in Belgium will lose its street art when it ceases to exist.

This abandoned Belgian fortress is purposefully being left to nature.

This historical Netherlands fortress still bears the marks of its single siege.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

A collection of abandoned typographic signs from Berlin and beyond.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

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

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

A 120-year-old legend concerning an empty circular patch in the North Carolina woods.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Abandoned power station once home to a squatter community, now being developed into an arts center.