A ghost town that held steady longer than most, but finally gave up the ghost.

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

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.

Some 10,000 works of ancient rock art cover these volcanic basalt outcrops near the Gila River.

The world's largest military aircraft cemetery.

This “living museum” at UCLA exhibits thousands of plant species from all over the world.

Resonating tubes make music from highway overpass.

More than 200 unconventional musical instruments that anyone can play.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

A spectacular Petrine Baroque summer palace commissioned for Catherine I by Peter the Great.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Time travel with sweets across history at this research-based candy store.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

After his presidency, George Washington planned to live only a few blocks from the Capitol building.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

A painfully obvious spy house sits right across the street from the Russian Embassy.

A small poultry graveyard in the courtyard of a popular Key West watering hole.

A historic presidential getaway on the continental United States' southernmost island.

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.