On this Puerto Rican island, many abandoned naval ammunition bunkers sit open while a few have been padlocked by locals as personal storage.

The world's brightest bioluminescent bay.

The bridge continues the legacy of President Franklin D. Roosevelt's New Deal policy.

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

From a supper club to a gay bar to an HBO shooting location, this 125-year-old Victorian mansion has lived many lives.

One of the longest water bridges in the world was built over a supposedly haunted swamp in Louisiana.

A symbol of Texas pride.

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

This museum preserves the heyday of Puerto Rican coffee.

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

These red and black houses were awarded to the firefighters who saved their city from an enormous blaze.

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

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

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

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

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

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

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

At this studio, musicians, engineers, and quite possibly a music-loving ghost carry on Puerto Rico's musical traditions.

This tiny home was originally a narrow alleyway.

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

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