The second-longest continuous wall on the planet protects a hidden secret in the deserts of India.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

The largest radio telescope in the world searches for extraterrestrial life from the remote limestone peaks of southern China.

The stickered marker pinpoints where the only maintained road in the United States crosses into the polar region.

The oldest pastificio in Queens offers visitors fresh noodles and a peek inside the macaroni-making magic.

This ghostly Alaska village still clings to a steep cliffside despite having been abandoned for over 50 years.

A collection of abandoned typographic signs from Berlin and beyond.

Giant animal sculptures are created with the rice straw leftover from the fall harvest each year.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

Stockholm's deepest subway station is also a stunning ecological wonder.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

This retro underwater observation tower would make the perfect lair for a sea-loving villain.

Legends of time travel and magical woodland creatures bolster the natural charm of this verdant sanctuary in the midst of Moscow.

The southernmost outpost of the Russian Empire in colonial America.

A wooden statue of an Estonian pagan god and King of the Setos stands atop a sacred hill.

A forest park outside Tallinn full of architectural and artistic curiosities.

This Soviet-era "closed town" was a top secret uranium producer often left off of maps.

Once standing on solid ground, this slender beacon is a victim of the very shoreline it was charged with announcing.

Man-made mineral caves house massive bat colony.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

A trio of giant wooden megaphones turn up nature's volume in this Estonian forest.

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

A fantastic reconstruction of a 10th-century Viking longhouse.