On a small Puerto Rican island, banks of secret naval bunkers lie abandoned and filled with piles of office equipment.

The world's brightest bioluminescent bay.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

This tiny home was originally a narrow alleyway.

This colorful gate stands as an entrance to the walled city of Old San Juan.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

The crumbling remnants of this 19th-century quarantine hospital hint at the touristy island's darker past.

This small fort played a huge role defending Puerto Rico’s capital city.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

The oldest house of worship in Palm Beach has a wonderful tropical garden.

"We Seceded Where Others Failed."

A monument celebrating the idea of reaching inaccessible places.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

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

The highway's southernmost spot is a beloved local attraction.

A historic landmark and museum filled with curious objects representing the history of Key West.

This statue inspired by Renoir's famous painting embodies the jovial spirit of Key West.

A historic presidential getaway on the continental United States' southernmost island.

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

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

Cuba's historical trains remind natives of their country's sugary sweet past.

The house that birthed The Old Man and The Sea is now a museum devoted to the old man who wrote it.

This pair of eccentric Ohio castles were built by a pair of brothers who wanted to bring a bit of class to the Ohio wilderness.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."