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

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.

Legend has it this historic port was a popular hideout and smuggling spot for pirates.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

The world's brightest bioluminescent bay.

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

This tiny home was originally a narrow alleyway.

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

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

After giving up Michelin glamour for his Amish faith, one chef now makes stellar sausages in a small, off-the-grid shop.