Apartment complexes built into huge repurposed natural gas tanks.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

The largest police museum in the western United States displays the evolution of crime-fighting Seattle.

Craft liquors concocted in an old Seattle warehouse.

Activists are fighting to preserve these unfinished highway ramps as a tribute to the citizen revolt that halted their construction decades ago.

A 1,000 pound brass bell commemorates a time when this small maritime neighborhood was actually its own separate city.

A frozen relic of Seattle's hydroelectric boom is now a teaching facility for future engineers.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

Visible below the waves are memorials to the city's Gold Rush dead.

Tiki luxury on Nob Hill.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

The only theatre in the world constructed specifically for sound movement.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

This shop specializes in oddities and Victorian-inspired wonders.

A 140-year-old castle with underground caves hidden in San Francisco.

Time stands still at this serene burial ground in the center of Budapest.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

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

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.