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

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

This "sausage route" features gorgeous views and family-owned restaurants.

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

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

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

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

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

Drift through underground caves on a tube.

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

An unnatural lake in a naturally beautiful setting.

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

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

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

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

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

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

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

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 brightest bioluminescent bay.

This communist country can still appreciate its fragrant past.

A nuclear power plant abandoned along with an international allegience.

A Spanish-style estate that has traded black ties for rock concerts.

Castro's communist ice cream mothership has been serving five-scoop "salads" for over 50 years.