Giant stone letters dedicated to the founder of Armenia's alphabet.

This set of concrete chambers resonates according to different notes of octaves.

First point in the Struve Geodetic Arc, a 19th century undertaking to measure the Earth's size and shape.

A historic scientific breakthrough that crosses nine borders.

Hundreds of small crosses have been carved into the bark of the trees outside this small Estonian village.

This small Estonian hill is covered in hand-made twig crosses that are said to bring good luck.

A beer pipeline runs beneath Bruges.

Mysterious craters may have been home to an ancient cult.

Every weekend, people gather here for a brief chance to see their loved ones on the other side of the United States–Mexico border.

Common all over Japan, kōbans are small community police boxes, and now one is guarding one of L.A.’s megamalls.

This symbol of peace is appropriately positioned overlooking the Pacific Ocean.

This ordinary-looking mailbox has a rather explosive history.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A steel paper plane is all that remains of a crashed aircraft that caused an amazingly small amount of damage.

"Only the dead get off at Kymlinge."

This Stockholm light tower can be controlled by anyone with a smartphone.

For the last century, this international border within a small town has appeared and disappeared various times.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Climb to the top of the world's largest seated bronze Buddha.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

South Korea's largely symbolic, barely used gateway to the North.

Japan and South Korea both lay claim to islands inhabited by one woman.

The site of many tense prisoner exchanges across the Military Demarcation Line between North and South Korea.

Numerical symbolism abound at East Asia's oldest observatory.