See four top-secret US spy aircraft of the Cold War era, including the legendary SR-71 Blackbird and the A-12 Oxcart.

On a secluded beach is one of the few shipwrecks left on the shores of Mauritania.

An early 20th-century fire lookout, still in intermittent use, preserves legacy fire-locating equipment.

This stone figurine was made more than 6,000 years ago and depicts a female deity of the Neolithic Vinča culture.

A unique local art exhibit that has continued to grow since 1989.

A volcanic cone that formed over 600 years ago.

California's largest steel arch bridge.

These natural wonders have taken millennia to form into the stunning marvels they are today.

This massive piece of aviation history calls this residential neighborhood home.

The Yiddish language stages a renaissance in a shtetl-inspired cultural center on the San Diego coast.

An architectural relic that survived the hands of time.

This record shop and unofficial black metal museum is an ode to Oslo's heaviest musical export.

Though it won't take you far, the wood train housed at this station is the last of its kind in Japan.

The tallest mountain in mainland Australia.

An inland seafood emporium makes more sense than you'd think.

This moss-covered, rocky outcropping looks like a mythical beast resting in the water.

Running through lush forests and across the Tadami River, this train line offers breathtaking views of rural Japan.

Located more than 600 feet beneath sea level, this tunnel boasts the world's first undersea roundabout.

Scrap material from around Eritrea finds a new life at this outdoor market, where upcycling is a lifestyle.

Famous in both ancient and modern times, the "mountains of the moon" are legendary for their beauty and biodiversity. But they are threatened by the changing climate.

A concrete arrow from a 1920s network of airmail beacons is still preserved at the western edge of suburban Reno.

Europe's "only museum dedicated to the decapod" is full of quirky and absurdist displays, including one featuring the "famous" Giant Crab of Margate.

Just outside Lesotho's capital city, a rock formation takes the shape of a powerful predator.

A Wild West saloon that helped define a generation of psychedelic rock.