This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

A flamboyant five-story building in Bulgaria resembles a crawling snail.

One of two lighted lanterns hung in the church belfry on the eve of the Revolutionary War to warn that the British were on their way.

The first woman in the United States to get a driver's license is buried here.

This eight-mile stretch of road gets its name from a local legend about a lost soul searching for his head.

This magical oasis in East Texas is one of the most biodiverse acres in the country.

During World War II, over 13,000 people of Japanese ancestry were forcibly removed from their homes and incarcerated in this camp in the Idaho desert.

Ride a mechanical corn dog at the alleged birthplace of America's favorite deep-fried wiener.

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

A large Melbourne wall is home to an iconic work of art from one of the world's most renowned street artists.

In 1986, Keith Haring was arrested for painting this anti-drug mural on a Harlem handball court.

The rodent-shaped sidewalk imprint that earned worldwide media attention.

This unusual apartment building may be Brooklyn's own version of the Leaning Tower of Pisa.

Known as the "Grand Lady of Jersey City,” the city's first racially-integrated hotel was owned by a preacher who was, depending on who you ask, a cult leader, civil rights pioneer, or the manifestation of God.

This building's name and a plaque are all that's left of what was probably the most important nightclub of the Madchester music scene.

A superb Paleo-Christian baptismal pool is preserved among the ruins of ancient Sufetula.

A grueling 699-step stairway to a heavenly view of the island of Saint Helena.

An early masterpiece of Le Corbusier, a famed Modernist architect, hiding in plain sight.

This penny stopped a bullet and saved a soldier’s life during the American Civil War.

For centuries, Germans have been dancing in trees.

A local museum honors the history of Bamberg’s unique cultural heritage: growing crops in the heart of the city.

A living museum of curated gardens honors 4,000 years of agriculture in the Santa Cruz River basin.

This millennium-old site reflects a time when sugar was a treasured commodity.

This grave marks the final resting place of pioneer John Chapman, better known as Johnny Appleseed.