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

Where lovers tie birch branches into long-lived knots.

At an isolated roadside rest area stands a monument marking where famous Western star Tom Mix died in 1940.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

1,500 Commonwealth servicemen of World War II are buried or commemorated in this cemetery.

Typewriter museum housing more than 1,500 machines preserves the history of the grandfather of computers.

A tiny, heartwarming piece of art hiding in plain sight.

Debatably clever, or just plain honest hotel advertised as "The Worst Hotel in the World."

Every spring, locals see the shadowy figures of a ghost army of slain Greek soldiers descend upon this ruined fort.

The historic “pink house on the hill” is an architectural gem that now serves as a center for water conservation.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

This once-derelict building is now one of the most beautiful bookstores in the world.

A stone pillar marking the location of the westernmost battle of the American Civil War only honors one side of the conflict.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

Five million people are laid to rest here, more than the population of Madrid itself.

The lengthy skeleton of one of the tallest Spaniards of all time is on display in Madrid.