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

The crumbling remains of a 19th century fortess.

The second-largest ceremonial mound in the United States is an artificial hill that is loosely shaped like a pentagon.

Ruins of a once-opulent grand Victorian resort.

A pair of giant legs paying homage to a poem, a king, and it would seem, socks.

A mysterious and endangered parasitic herb from the California desert.

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

An antiquated German apothecary on Chicago's North Side.

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

This "floating island" plateau sits 7,671 feet above the forest floor.

Largest site of dinosaur footprints ever found includes more than 5,000 tracks.

A vast landscape of craters created by meteorites.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

An Archaeological Wonder of Peru, and the largest stone ruin site in the New World.

In the most arid desert on the planet, the world's leading telescope allows astronomers to see more than has ever been seen before.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

Little Red Lighthouse under the George Washington Bridge.

An unassuming secret door once led to a legendary watering hole.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

One believer transformed a local curiosity into proof of Vikings on the Great Plains.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

The last Americana on Route 66.

A ring of creosote bushes that are estimated to be 11,700 years old.