The famous artist couple lived and worked here, in two different houses separated by a bridge.

Frida Kahlo's childhood home, now a museum of her life and works.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

The ruins of the first Spanish settlement in Puerto Rico.

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

This small primate research island is teeming with playing, fighting wild monkeys.

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.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

A glittering Thai Buddhist temple in suburban Pennsylvania.

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.

Tour the sci-fi-esque reality of governmental disease management.

These medicine cabinet staples are part of the museum's collection of everyday objects.

The abandoned coal loading dock is a canvas for unsanctioned art.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

This forgotten Frank Lloyd Wright house is an architectural marvel at the end of a sleepy residential street.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

Located on 420 acres in the high desert, this spiritual center is dedicated to the "science of the future."

This architectural triumph is the only Frank Lloyd Wright house in Alabama.