The world's brightest bioluminescent bay.

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

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

On a clear day, you can see all the way to the Virgin Islands from the top of this observation tower built in the 1960s.

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

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.

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

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

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

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

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

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

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

A former pyramid-shaped library with colorful murals lies just across the bay from Old San Juan.

Puerto Rico's oldest rum producer started its 140-year-old business with "a little barrel."

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 piece of Michigan is entirely surrounded by Ohio.

Ancient petroglyphs discovered only after a massive fire swept across Michigan in the 1880s.

Reason for Michigan's potential diamond mine.

House built with over 60,000 glass bottles.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

This lovely public park has an intriguing past and unique wooden bridges made of concrete.

The only diamond mine in the world where you can keep what you find.