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

A church of bones, decorated with 40,000 human skeletons.

Macabre astrological automaton clock dating to the late 1400s.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

Explore the frozen river and take a walk to a nearby island on some of the longest ice roads in Sweden.

Gravity seems to fail at this intriguing Swedish attraction.

A tiny village is home to the world's only diner completely devoted to the many varieties of traditional Swedish dumplings.

Winter roadtrips are a little more exciting on this seasonal, slippery expansion of Sweden's national highway system.

Stockholm's famed ghost train is now on display at an art park in northern Sweden.

Said to be one of Sweden's most haunted places, this vicarage once even attracted a ghost-busting priest.

A botched 18th-century canal silenced one of Sweden's most magnificent waterfalls.

This serene wooded hilltop has a dark history as the climactic point of the Swedish witch trials.

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

This large sand dune in the Netherlands is home to wind-whipped trees with "floating" roots.

A monument hidden in the woods built in 1938 as a getaway for a Dutch museum curator.

A grassy pyramid named after a French battle.

This magnificent museum claims to house the cranium of a disciple and the skull of a pope.

This former insane asylum now holds a pathological anatomy museum.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The final resting place for the remains of 143 Habsburg royalty.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.

The personal charnel house of Anton Bruckner.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.