The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

A community of collapsing homes more than a mile out from the Florida coast.

The only remaining piece of hull of the most decorated US ship of WWII is this giant name plate.

A rare underwater observatory in the Caribbean that provides breathtaking views of vibrantly colored aquatic life.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

The 28-foot granite map plots the locations of 40 theaters in New York City.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

New York's oldest magic store.

Salute the leader of the proletariat.

Elevated freight railway turned wildly successful urban park.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

This balancing rock is one of Utah's most unusual geological formations.

The remains of an early 1900s dude ranch that operated until the 1970s.

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

Oddly shaped rock formation, misassociated with a nearby utopian community.

The natural history of Utah is on full display inside this museum.

Inside this striking glass building, visitors can see thousands of dinosaur fossils in the positions that nature deposited them more than 150 million years ago.

A small oasis not far from downtown Moab.

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

This Moab institution functions as both a rock store and a small natural history museum.

A sharp bend in a dramatic river canyon cut through red rocks.

The location where the iconic movie character declared it was time to go home.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.