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

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Macabre astrological automaton clock dating to the late 1400s.

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

Step inside Lucy, the world's largest "elephant."

In which a local geological marvel becomes a quaint roadside attraction.

Mysterious rocks that ring musically when struck.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

The first American department store, and home to the largest operating musical instrument in the world.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

World's first "penitentiary," meant to be humane, drove men insane.

This single room has survived the centuries with almost no deterioration.

The vast, legendary catacombs hold secrets much stranger than stacked bones.