An encyclopedic collection of mammal penises.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Eclectic collection of rare and beautiful stones in a historic home.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

Home to three historic ships from the age of Vikings.

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Copenhagen's celebrated theme park and gardens.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A modern mechanical planetary system, part of a 10,000 year clock.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

Where a staggering 747 ships were constructed during World War II.

A 90-acre park on former landfill that hosts an annual kite festival.

The Laureates here get something even more coveted than a Nobel Prize: free parking for life.

This subtle Berkeley paving stone actually marks off a lawless tube of air that extends into space.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

A celebration of once forgotten materials.

A pier that used to act as a busy ferry dock is now a decaying favorite of local fisherman and urban artists.

A private home built to resemble the shape of a microscopic creature.

An vast warehouse of everyday treasures in Berkeley, CA.