The final resting place of soldiers' loyal canine companions.

The modern birthplace of Irish freedom.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

One of Ireland's most infamous prisons for rebels including men, women and children.

The biggest drug trafficking passage between Mexico and the U.S.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

Introducing the Green Fairy to her fawning masses.

A snapshot of the city's fascinating voodoo culture.

The final resting place of New Orleans' most famous voodoo priestess.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

This tiny patch of arid sand sits in one of the greenest states in the United States.

This grave marks the final resting place of a legendary frontiersman... unless it doesn't.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

European castle ruins in an American state park are actually the product of death and grief.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

This abandoned prison castle has become an imposing gallery of graffiti art.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

This Italianate Villa-style castle is pretty to look at, just keep off the private property.

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

Ancient pueblos built into the base of a natural canyon wall.