Historic funicular railway, believed to be the shortest railroad in the world.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

Beautiful Victorian buildings from L.A.'s forgotten architectural past.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

The house where John Wilkes Booth conspired with his co-conspirators.

Home to items never before seen by the public.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

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

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

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

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

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

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.

Stalactites and stalagmites in a beautifully lit cave.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

The oldest volcanology research center in the world.

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.