Sweden's "good old days" painstakingly re-created in a model village.

Massive, unfinished broadcasting station stands as a monument to the fall of communism.

One of the largest mines in Bulgaria is now home to a vast museum more than 100 feet underground.

Crossing a suspension bridge above a forest is the only way to reach this 12th-century monastery.

Not far from a popular beach, an unfinished, abandoned mansion for Bulgaria's last communist dictator.

An unfinished complex built for children from around the world sits abandoned on the Black Sea coastline.

These natural cliffs look like they are a part of an old castle complex.

A mysterious tunnel hidden in the shadows of a colorful, historic sanctuary.

Mysterious standing stone formations looks like a petrified forest.

In a long-dry lake bed, these groups of massive stone pillars bear a striking resemblance to clumps of everyone's favorite fungi.

The second-largest Jewish temple in Bulgaria was deserted after World War II, seized by the communist government and then abandoned again.

A spectacular Bulgarian cave resembling a devil's head with a waterfall rushing down its throat.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

Outside of one of Britain's most renowned social clubs, a step installed specifically for the Duke.

These marks in Myddelton Passage aren't your run-of-the-mill vandalism, and they weren't made by your typical vandal.

A lasting remnant of The Blitz.

Though it's not the largest, this one-kilometer outdoor market is reportedly the longest in Europe.

This Underground station has been a popular filming location for decades, even before it closed.

England's most famous front door has an accidental doppelganger.

A fully functional, 200-year-old remnant of the time when Brixton was mostly fields.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

An archive of ceramic eggs painted to record clowns' personal makeup designs.

The fences outside some of South London's estates are made from recycled World War II stretchers.