Prison made famous by The Shawshank Redemption has been out of commission since 1990.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

An overlooked memorial honoring the local Washington residents who died in World War I.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

This recently restored timepiece has stood all around Kansas City.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

During the summer, surfers in Alaska take advantage of this inlet’s unusual water patterns.

A suburban street in Anchorage doubles as a runway, and each home has its own airplane hangar.

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.