A real flying saucer, contracted by the U.S. Air Force.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

A monument to a Native American leader who was known for never breaking a promise and met his end after signing a deal with white settlers.

A bit of retro transportation flair preserved in the world's largest department store.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

A small section of Boise, Idaho maintains the unique culture and traditions of the Basque people.

An original apothecary from 1792.

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

A diorama of the Civil War, fought by cats.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Elevated freight railway turned wildly successful urban park.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Enormous lake at the bottom of a unique cave system.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

This Indiana walk of fame honors music legends with record-shaped plaques in the pavement.

Inside this magical collection, you can buy recipes cooked up by church ladies, motorcycle clubs, and clowns.

A historic Civil War estate-turned-museum looks back on the Confederate States of America.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

The seat of Buffalo government is a gorgeous Art Deco palace.

This underground oasis is one of North America’s most fascinating prehistoric places—and you can scuba dive in it.