The only remaining U-boat that is still floating never actually saw any action in World War II.

A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

This state park was once an important Native American cermonial center.

The remnants of the fortress that saved Georgia from the Spanish still stand guard on their swampy island.

Carved faces add a touch of magic to this island's impressive oak trees.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

Four metal statues of massive animal penises stand outside the university's Animal Sciences building.

Former utopian colony based on the belief that the universe exists in a hollow sphere.

The third tallest lighthouse in America once guided author Stephen Crane to safety.

A building so large that it has its own weather.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

A haunted hill that supposedly defied gravity.

A place for ship-lovers to watch the passage of freighters traversing the Great Lakes while learning about their history.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

What was once the largest NFL stadium.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

A daily pyrotechnic celebration marks a beloved tradition during Valencia's festival season.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

Medicinal spa created with the discharge from a geothermal energy plant.

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

Two stone columns flank the grand Venice square, but there were supposed to be three.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.