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

The world's brightest bioluminescent bay.

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

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

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

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

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

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

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

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

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

This tiny home was originally a narrow alleyway.

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

The short hike is worth the stunning views and crystal blue waters of a secluded beach.

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

This sustainable, family-run farm just outside of San Juan makes for a dreamy daytrip.

An artist’s underground sanctuary, 40 years in the making.

A park where people have been going to feed friendly pigeons since the 18th century

A place to pay homage to Taíno heritage.

This rock in the middle of a river in Jayuya contains dozens of Pre-Columbian Taíno petroglyphs.

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

This former railroad bridge was named after the great river that once flowed below it.

This ''hidden'' 19th-century bridge played a simple, yet important role during the Spanish-American War.

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