Archaeological sites and great food inside the island's largest mangrove forest.

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

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

Drift through underground caves on a tube.

Everyone from Alan Ginsberg to The Rolling Stones has stopped by this classic dive bar.

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

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

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

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

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

The location of Puerto Rico's first water bottling plant, thanks to a collaboration between Mother Nature and technology.

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

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

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

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

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.

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

The world's brightest bioluminescent bay.

The only home of the famous French impressionist painter open to the public is now a museum and bed and breakfast.

The curiosities and wonders of pharmacy in a delightful historic building.

The first patented shaved-ice machine heralded a snowy wonderland of iced treats at a favorite New Orleans summer shack.

This New Orleans boutique and nursery specializes in rare flora, with a focus on carnivorous plants.

After the parade, students throw their beads on the tree hoping for good luck on exams.