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

This 20th-century mansion plays a key role in one of Puerto Rico's greatest novels.

Invading U.S. troops were first seen from this now-abandoned tower, leading to the Spanish-American War.

This beachside town is home to a diverse nature reserve, multiple cays, and one of the three bioluminescent bays in Puerto Rico.

A resilient tree that has survived for more than 700 years in Guánica Dry Forest.

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

Drift through underground caves on a tube.

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

An unnatural lake in a naturally beautiful setting.

La Cara del Indio honors the Taíno chief who fought bravely against the Spanish invasion of Puerto Rico.

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

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

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

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.

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

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

This beach pool offers a spectacle of crashing waves, blue hues, and a historical lighthouse.

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

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

Enjoy the waters of this half-moon-shaped natural pool surrounded by breathtaking scenery.

A natural swimming pool in the middle of the Carite Forest.

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

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