Ancient paintings known as the "Sistine Chapel of Cave Art."

A little sculpture with a large wardrobe.

Climb inside an iron crystal magnified 165 billion times its normal size.

This factory dominated the Swedish market, and is now a historic site.

A devilish mask still mocks a king’s rumored love nest across the street.

A mosaic tribute to a hitchhiking cat turned national celebrity.

Sweden's first Viking city is also the site of thousands of burial mounds.

A catapult rock from Gotland’s 13th-century civil war is still lodged in Scandinavia's best-preserved medieval city wall.

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 early Korean refrigerator.

This human-made pond is part of a Korean palace complex first built in the 7th century.

The supreme shrine of the state.

Numerical symbolism abound at East Asia's oldest observatory.

One of only a handful of seaside temples in Korea, this sacred space is home to a legendary healing Buddha statue and a traffic safety prayer pagoda.

Home to more than 13,000 pieces of war memorabilia and military equipment.

South Korea's women of the sea have completely flipped their society's structure by becoming revered fisherwomen.

A unique structure located on the grounds of one of five grand palaces that were built by the Joseon dynasty.

This is the oldest Roman-made bridge in the city still existing in its original state.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

An oasis of beauty, tranquility and botanical research in the middle of Rome.

A centuries-old copper mine that once provided two thirds of the world's copper supply.

Unfortunately, you can no longer spend a night in this single-person treetop hotel.

The official meeting point for the oddly named governing assembly of ancient Sweden.