Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

This golf ball–shaped former desert real estate office now houses a UFO museum.

Modern megaliths form this work of cosmic, Celtic landscape art.

A 30-acre garden inspired by the principles of modern physics.

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

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

A monument celebrating the idea of reaching inaccessible places.

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

Near the ruins of a Civil War coastal fortress lies the only known African refugee cemetery in the United States.

Here’s how Robert the Doll earned his reputation as the most haunted doll in the world.

Even Henry David Thoreau found this glacial pothole irresistible.

A sewing machine tycoon built this miniature castle for the people and to beautify a lakeshore.

The world's oldest and largest museum of mass transit vehicles.

The world's largest rotating world.

This tiny patch of arid sand sits in one of the greenest states in the United States.

The 92-foot-tall structure is based on the aircraft that carried the first Americans into space.

A giant toy jack made of numerous welded-together fire hydrants.

This New England covered bridge is home to the tale of a jilted lover known to haunt the area.