A wall of chewing gum moonlights as collective art.

A walk through the historic city center, under the streets of Seattle.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A library built during San Francisco's pioneer times is a student's retreat, bibliophile's sanctuary, and chess player's delight.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

A naturally mummified 2,000-year-old man.

Elaborate tile work in this railway station tells the story of Portugal.

The prototype for all Nazi concentration camps.

The fairy tale castle of the "fairy-tale king."

The bears of Bern have been a city highlight for over 500 years.

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

The Guardian of Tallinn.

A black cat protests the City Guild in Riga's Old Town.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Cemetery established by the Victorians as a solution to the overflowing graveyards.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

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

3,000 market stands in five former Zeppelin hangars.

A hotel and restaurant serving as the mecca of kitsch.

From the Difference Engine to the Cray-1, all under one roof.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

Come for the flowers, stay for the bats!