Every equinox this Maya pyramid puts on a spooky ancient light show.

These azure waters were thought to lead to the Mayan Underworld.

Frida Kahlo's childhood home, now a museum of her life and works.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

At first glance, little checkered structures on the hillside look like they house the living, not the dead.

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

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

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

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

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

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

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

Legend has it this historic port was a popular hideout and smuggling spot for pirates.

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

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

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

This tiny home was originally a narrow alleyway.

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

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

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.

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