Visitors can swim with vicious predators in Crocosaurus Cove's plastic daredevil enclosure.

Right up until the 20th century this network of man-made caves was the biggest village in Eastern Armenia.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

On Japan's Tashirojima Island, cats are king.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

An English artist has turned an unassuming ex-council house into a time-lost house of mystery.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

Built by the patron saint of illusionists this Elizabethan manor house is riddled with secret cubbies for hiding priests.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

This enchanting Victorian estate was home to the world's first hydroelectric power generator.

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.

This abandoned five-star hotel is now a five-star urban exploration destination.

This Russian locomotive museum was once devoted just to Lenin's funeral before expanding to encompass Moscow's entire train history.

This former Cyprus flight hub is now a crumbling, abandoned ghost complex.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

This stunning Brazilian library contains the largest collection of Portuguese texts outside of Portugal itself.

An ancient Ethiopian cave church is endangered by the simple building of a road.

This ancient mountain monastery welcomes all manner of faith in an effort to keep Christians in Syria.