This retro underwater observation tower would make the perfect lair for a sea-loving villain.

The only remaining historic maritime signal station in the United States.

Art Deco stylings conceal the true nature of this bridge.

The country home of world-famous designer, writer, and artist extraordinaire, William Morris.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This may be the smallest length of railway in the United Kingdom.

Stocking up on the world's best beer requires a pilgrimage to a monastery drive-through.

For those going through a life transition, a place to leave behind a piece of your former self.

This old KLM airplane cut into three parts was transformed into an eclectic airport gift shop.

The world's longest tunnel with an undersea section.

This temple was constructed entirely by Roman soldiers.

This historic aviation building is now a museum owned and operated by Disney.

This aircraft museum is home to one of just three Halifax bombers in the world.

When oil was discovered just outside of Pittsburgh, the city became home to this regional stock market.

In this subterranean brick arcade, a small shop continues the ancient practice of bookbinding.

A saloon and inn that served the Wild West's most iconic figures—and is still haunted by some of them today.

This small, unassuming street is now a canvas for color and creativity.

This fresco-covered medieval monastery hangs from the side of a steep cliff.

This century-old cinema is complete with musical interludes and boasts a rare projection system.

This ingenious engineering solution was built to stop the "theft" of canal water.

Once a dining hall for boarding school students, this lodge was a popular haunt for nuclear physicists working on the Manhattan Project.

The largest timber structure in Europe.

The highway's southernmost spot is a beloved local attraction.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.