Underneath this small church are 15,000 bones, arranged by an obsessive academic.

The world's oldest known salt mine.

An Austrian house of bones filled with hundreds of intricately painted skulls.

Dedicated to this region's early settlements and rich history of salt mining.

A remarkable feat of Victorian engineering across the Firth of Forth.

A striking lighthouse with views of the Gulf of Mexico and of a military air show.

What if the cure for all that ails you was as simple as repeated exposure to low-dose radon?

A memorial to 350 people burned at the stake for witchcraft.

Chicago's North Park Village was once the largest municipal sanatorium in the country.

Centuries ago, red and white wine poured from the statue's breasts whenever a new Venetian ruler was elected.

This abandoned but well-preserved Prussian fortress sits abandoned in a Polish forest near the German border.

This was the second largest mercury mine in the world and one of the oldest preserved mine complexes in Europe.

This winding road through an Italian canyon may be the most scenic drive in the world.

Hang with reindeer at this 400-year-old Sámi market.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

Where the sleeping monsters of Scotland's oil industry are left to rust.

A museum specifically dedicated to the Trabant, one of the iconic automobiles of the GDR.

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

The world's largest underground iron ore mine.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.

Austria's very first and only nuclear power station was completed but never used.

Inky sludge oozes to the surface of this beach thanks to a rare natural tar seep.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.