These red and black houses were awarded to the firefighters who saved their city from an enormous blaze.

The ruins of the first Spanish settlement in Puerto Rico.

This memorial to a family's dead son has survived a century of hurricanes and earthquakes.

This tiny home was originally a narrow alleyway.

This nearly abandoned "company town" is a ghost of Puerto Rico's once-lucrative sugar industry.

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

This giant bronze image of Christopher Columbus embarked on a voyage of its own.

An enchanting natural wonder in Puerto Rico's Camuy River Park.

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

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

The abandoned remains of this once-thriving hotel looms over the city, awaiting an uncertain future.

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

Years of neglect and nature took a toll on this 19th-century lighthouse.

The highest peak in Puerto Rico is home to a rare fern that can only be found on six trees at its summit.

This former sugarcane transport tunnel is now a portal to a lovely beach.

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

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

This niche museum devoted to ancient religious artifacts is shaped like the very thing it displays.

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

The world's second largest single-dish radio telescope, once used to contact E.T.

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

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

The world's brightest bioluminescent bay.

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