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

It's a pretty creepy lock-up.

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

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

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

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

The museum chronicling a treasure hunter's dream, fulfilled.

A small poultry graveyard in the courtyard of a popular Key West watering hole.

The island residents are known for taking their quirky sense of humor with them to the grave.

"We Seceded Where Others Failed."

A monument celebrating the idea of reaching inaccessible places.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

This legendary "evil" doll has been haunting the citizens of Key West for over 100 years.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A lush indoor jungle fills this bustling Madrid transportation hub.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Where Venice's gondolas go for a tune-up.

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

Go inside to really appreciate this 500-year-old technological masterpiece.

This community on a small Venetian island has taken to painting their houses in bright neon hues.