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

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The first museum in the world devoted to sexual gadgetry.

This historic rec center in the heart of Israel is a bastion of peace and togetherness.

Despite a legend that says this highest peak in Oregon was climbed in high heels, scores of people have died on its slopes.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.

The mass grave of a heroic Revolutionary War regiment sits below an empty lot near the Gowanus Canal.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

Cryptic messages embedded in the New York City sidewalk.

Rummage through this sunken ship, but leave your scuba gear at home.