This now-defunct synthetic fuel plant was once a major cog in the Nazi war machine.

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

The concrete skeletons of an abandoned Swedish town hide among the trees.

"Only the dead get off at Kymlinge."

This homeless brass fox tugs at your heartstrings from the foot of a Stockholm bridge.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

A replica of the beloved character's house, modeled after the author's own drawings.

This sublime architectural marvel is a rare example of an expressionist church.

Now abandoned, the world's first torpedo factory is crumbling into the sea.

These gutted monastery ruins still stand proudly in the middle of the Italian countryside.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

The sunken structure looks like the victim of a catastrophic flood.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This abandoned Belgian fortress is purposefully being left to nature.

This small, hidden cove is home to abandoned boats.

A mysterious, abandoned building rotting on the Brooklyn waterfront.

This crumbling, graffiti-covered mansion sits tantalizingly within reach of the proletariat who frequent a public park.

The remains of a century-old mansion that met a fiery demise years after it was deserted.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

A former connection to City Island, it has been abandoned since the 1930s.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.