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

Man-made geyser that rises to the exact height of the Gateway Arch.

Museum dedicated to the art of cutting and polishing stones.

First known as the "Sample House," this construction mash-up was meant to be a living catalogue of building styles.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

This cheerfully-named branch of the Chicago River is the fetid result of years of blood, entrails, and meatpacking waste.

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

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

Former bath house turns gastropub.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

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

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

A hot dog stand where the heads are just as hot as the dogs.

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

The world's only known button museum.

Shop of curiosities with a dinosaur museum tucked in its basement.

A Bibliophile's Dream.