The world's brightest bioluminescent bay.

This tiny home was originally a narrow alleyway.

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

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

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

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

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

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

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

These crudely shaped folk giants may be the the second most photographed statues in the U.S.

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

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

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

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A pair of gigantic baby heads greet passengers at Atocha Station.

A lush indoor jungle fills this bustling Madrid transportation hub.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Chewing gum tycoon's memorial lies perched over wife's botanical gardens on Santa Catalina Island.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

The decor of this Hollywood movie palace just barely predated the opening of King Tut's tomb.

The final resting place of a space program monolith, soon to be unveiled again to the public.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.