This historic hotel invented the chocolate brownie.

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

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

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

A hollow cement depiction of time's inexorable effect on the human body.

The sign to a demolished amusement park now stands in front of a local library.

Pumpkin-like gargoyles and grotesques peer down from the rooftop of this unassuming apartment building in Illinois.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

Less a museum than a bizarre fantasy world created by artists and engineers.

This hidden park hosts a rogue’s gallery of eccentric architectural obelisks.

The only example of a Paris Métro sign in use at a subway station outside of the French capital. 

A massive Montreal stadium that has seen nothing but trouble since its inception.

This iconic water tower and failed bandstand is open for panoramic views once a year.

A six-story-tall golden pyramid, surrounded by a moat.

This house renovated by Frank Lloyd Wright was the centerpiece of a lavish 20th-century estate.

Tour the luxe "glass cage" that inspired and unnerved the architecture world upon its debut.

A bizarre house filled with an astounding array of collections.

Local myth claims this is a Sears catalogue home with its windows installed upside-down.

This kitschy tavern is also home to rare early editions of "Treasure Island."

A once-groundbreaking power plant turned into a hotel and mini-museum of archeological and geological wonders.

The Brutalist building harbors an unusual inverted dome that swoops down over its central sacred room.

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