This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

The largest brick bridge in the world.

A museum that chronicles the history of the Nuremberg Trials for Nazi war criminals in the building where the trials were once held.

This lurid German fountain plots the sad course of marriage from dating to death.

A spring-fed pool so deep it's used for scuba diving as well as swimming.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

A house carved into a rock in the 1940s.

The fifth-longest natural arch in the world, and the longest outside China.

This former mining railroad is one of the best-preserved short lines in North America.

The longest living non-clonal organisms on Earth.

A whimsical, punny collection of "fence art" outside the tiny mountain town of Baker, Nevada.

A shady solar power system that couldn't hold up to the harsh desert conditions.

This coastal cavern is associated with the Hawaiian god of creation.

A glass display case holds the document that ended the Second World War—which one person signed on the wrong line.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

The last standing piece of a famous Honolulu landmark.

Hawaii’s largest cemetery rests inside an extinct volcano crater.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This saltwater swimming pool, which is the last of its kind in the United States, is slowly crumbling within sight of multiple high-end beachside hotels.

This departure gate in Austin's airport sends travelers to over 120 imaginary destinations.

Like a kitschy mirage in the Mojave, this eatery serves up classic 50s-style diner meals and a dinosaur sculpture garden.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.