This 20th-century mansion plays a key role in one of Puerto Rico's greatest novels.

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.

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

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

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

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

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

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

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

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

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

A colorful square marks the heart of the city's LGBTQ community.

Scattered around Atlanta are little doors with big charm.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

A famous flea market artist's studio that's full of odds and ends.

One of the largest Native American shell middens stands 30 feet tall.