It commemorates one of the world's earliest telegraphs.

For decades, it has disappeared and reappeared as water levels rise and fall.

A sign marks the plane crash that caused two nuclear bombs to fall in North Carolina.

This ruin in a suburban park may be the place where Shakespeare's "A Midsummer Night's Dream" was first performed.

Aged nearly 1,700 years, the world's oldest bottle of wine is probably still drinkable.

A beautiful but toxic fountain of mercury.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

This Canadian island is a veritable garden of decay with countless abandoned structures dotting the landscape.

Behemoth, cannon-like telescope operated by generations of Irish earls.

Built after WWII, the observatory site for the University of Copenhagen exhibits once world-class instruments.

Six beautiful wooden giants are hidden around Copenhagen.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

A Very Low Frequency transmitter you can tune in on your PC.

Few would expect the world's oldest preserved oil refinery to be found in Sweden.

A Japanese video game arcade hides in the back of a Swedish pool hall.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

A peat bog in southern Sweden provides a cozy and photogenic home for junked Volvos, Saabs, and the occasional American muscle car.

Take a giant yellow bird cage to the top of Elba's highest mountain.

Hiding the longest subterranean river known in the world.

Somewhere there is a giant who can no longer poop, but now travelers can stay inside his anus.

Because sometimes you need to make a batch of frites even when the stores are all closed.

A sanctuary for sickly, stray, or wounded donkeys.