Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

A tribute to Ponce de Leon's supposed quest for eternal youth.

St. Augustine's record-setting narrow street was designed to protect against pirates.

Bronze footprints mark the path where a civil rights leader tried to march in peaceful protest before being knocked unconscious.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

Built around 1723, this is the oldest surviving home in the U.S.'s oldest colonial city.

Where serial killer Aileen Wuornos drank her last beer.

In this small strip mall resides the largest collection of original art from the famed TV artist.

Strange beasts lurking in a garden are all that remain of a quirky, short-lived theme park.

One of the oldest, tallest, and most haunted lighthouses in America.

A secret, rocky playground hidden amongst the plain white beaches of the Florida coast.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

A walk through the historic city center, under the streets of Seattle.

The Denny Substation has been called "the coolest substation in the world" and sits in a densely populated Seattle neighborhood.

A community gathering place that once housed half-ton tanks and the World's Fair.

A tribute to the Nirvana frontman hides beneath the bridge that was the singer's beloved hangout spot.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

A little-visited waterfall in an otherworldly landscape.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

A Roman-style column in Oregon hides a spiral staircase inside.

A unique post-modern public space in the middle of the Warehouse District in New Orleans.

In 1857, the Mardi Gras parade tradition began at this intersection.

Colorful, cheeky signs spill out of legendary New Orleans folk artist Dr. Bob's Bywater studio warning you to "Be Nice—Or Leave."