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

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

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

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

The grandson of a Kiowa chief created what has become the iconic symbol of a city on the Plains.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

A mysterious and terrifying public art goblin seemingly meant to inspire local legend.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

This rustic cabin, outfitted with gun slits, was once home to John D. Tewksbury, patriarch of the bloodiest family feud in American history.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Memorializing an American tragedy of massive proportions.

The Cadillac Ranch for monster truck aficionados.

The world's largest vertical wind tunnel.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

Steepest flood safety railway in the entire world.

The world’s first penitentiary, meant to be humane, drove men insane.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

The celebrated eyesore created by starry-eyed sweethearts.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

You would never come across this tiny green oasis if you didn't know it existed.

Meet the bronze beloved pet to a family of famous peeing statues.

A little sculpture with a large wardrobe.