When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

Stockholm's narrowest alley is barely over two feet wide.

A man has revenged his true love's betrayal through tears and stone genitalia.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

Sweden's "good old days" painstakingly re-created in a model village.

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

It houses the remains of a 17th-century version of the Titanic.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Once a highly polluted body of water has now been transformed into a gorgeous lagoon.

An art installation that will challenge your understanding of reality and perception.

Four steel monoliths stand in the Qatari desert, in a breathtaking work of large-scale art by Richard Serra.

An abandoned fishing village in pre-oil Qatar.

Some of the ancient-looking huts among these strange rock formations aren't ancient at all, but built as part of a movie set.

A 19th century pearling and fishing village abandoned before Qatar's economic boom.

The shallow, salty inlet was a safe haven for 19th-century pirates.

A staggering number of rock carvings in an abandoned quarry.

A mesmerizing wonderland of salt-encrusted tree branches and pencil roots.

Climb down into the largest sinkhole in Qatar.

Ming Dynasty necropolis raided during the Cultural Revolution.

Why walk on this historical site when you can zoom down instead?

The most famous location in China was home to whole dynasties worth of imperial rulers.

This small, unassuming street is now a canvas for color and creativity.