This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

The show's fictional Korean medical camp was created in the Santa Monica hills.

A glittering South Asian anomaly in a wealthy Los Angeles suburb.

Auburn's iconic eagle flight goes back to a 19th century eagle that dropped dead on the field after inspiring the football team to victory.

Booker T. Washington's home at the Tuskegee Institute was a gem of splendor.

Artist James Turrell's ode to dawn and dusk on the campus of Rice University.

This hidden sculpture garden full of Wild West art is one of San Antonio's best-kept secrets.

This town is home to the world’s largest arch constructed entirely of elk antlers.

A beautiful geyser under environmental threat.

A collection of huge Pre-Colombian structures in Alabama.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

An architect's childhood fantasy treehouse made real.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The world's longest known cave system.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

A 19th-century cabin built into a hollowed-out Sequoia tree.

Quite simply the largest tree in the world (by volume).

These six walrus head statues harken back to a time when this area wasn't far from the oceanfront.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

This now-deactivated naval base defended the Florida coast for centuries.