The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

Paris' linguistic guide to the international language of, yes, love.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

With its vaulted ceiling and gilded details, this University of Washington library would feel right at home inside an old palace.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

A wall of chewing gum moonlights as collective art.

A colorful architectural gem in Seattle's uniquely modern Central Library.

Now housed in a museum, this giant pink elephant stood in downtown Seattle for more than 60 years.

The first park built over a freeway is a brutalist masterwork.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

This private residence was the template for one of the most beloved television homes of all time.

A display of magnificent stained glass windows is the first exhibit of its kind.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

Rifle through images of skyscrapers, Worlds Fairs, and more in the largest public postcard repository in America.

To find the "unicorns of the deep" you've got to go downstairs.

This historic-shipwreck-cum-diving-spot can still be seen poking its boiler out of the Lake Michigan waters that claimed it.

One of the last functioning antique elevators in Chicago.

The 30,000-volume library is one of the world's most impressive poetry collections.

Home to a protest movement, a bombing, and a dramatic change in labor history.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.