The library's graceful rotunda is like a bibliophile's temple.

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

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

A large collection of ancient runestones decorates this university courtyard.

This mysterious runestone embedded in a church wall is linked to the medieval cult of Saint Erik.

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

Uppsala's adorable feline sign celebrates a popular children's book set in the Swedish city.

Ancient burial grounds of the wealthy.

The second oldest anatomical theater is housed in a museum of curiosities.

The largest known meteorite on Earth was too big to move.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

A public display of prehistoric space rocks is named for the Namibian village where they were found.

Despite many attempts to finish this overpass, it has been abandoned since the 1970s.

The South African dialect's complex history is immortalized in stone, in one of the world's only monuments dedicated to a language.

A rare cluster of alien-like plants grows along a dusty highway.

South Africa's postal service began with a letter left in a boot beneath this tree.

Largest cave system in Africa.

Local lore says a serpent-like beast lurks in the deep basin below the falls.

Sculpture park built by a 50-year-old widow.

The subterranean sanctuary home to local shamans is a sacred site for people of all religions.

Mined to a depth of 240 meters with a perimeter of about 1.6 km, the largest hand-dug excavation in the world.