The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

The walls and streets of the ancient city are peppered with penises.

This ancient market is often referred to as the oldest shopping mall in the world.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

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

Ancient snack bar of the Roman Empire re-opened.

Go inside to really appreciate this 500-year-old technological masterpiece.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A museum celebrating rare American motorcycles where everything runs—and none of it quietly.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

The fine fabric handwoven at Biltmore Industries was once coveted around the world.

Classy up your Big Mac with bow-tied servers and chandeliers at the world's fanciest McDonald's.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

Elvis's own personal tropical hideaway.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

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

10,000 flowered plants bloom in the City of Roses.

A grassroots community effort in the 1970s led to the creation of this beautiful garden full of delightfully whimsical exhibits.