This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

This clifftop arch is a natural stunner.

The enchanting home of an eccentric Swedish physicist and author sits in the hills of Anacapri.

The glowing blue Nymphaeum of Emperor Tiberius.

Legend says this sacred tree was a gift from goddess Athena.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

The hallucinogenic center of the ancient world.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

Rumors of the occult haunt this upscale 1920s hotel.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

An early-19th-century hotel with a past that is steeped in the Civil War.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

This kitschy tavern is also home to rare early editions of "Treasure Island."

I-95's Tijuana-style celebration of kitsch at the Carolina border.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

The former home of the oldest nail maker in the United States was built on the ashes of a mill burned by the British.

Every December the Wannalancit Mills lights a Christmas Tree over the old mill's smokestack.

A luxury hotel constructed out of a former jail.