This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

A military museum and library dedicated to the citizen soldier.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

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

Where old school Polish Chicago and young hipster Chicago live side by side.

A shining sculpture made of 3,115 lights, the number of visible stars in the Northern Hemisphere.

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

An avant garde art museum at the University of Chicago.

This modest post office sits on the site of H.H. Holmes' famous murder castle.

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

Built to house a chapter of the Knights Templar, this grandiose building is a relic of Freemasonry in Chicago a century ago.

The 606 is a decade in the making.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

These pretty kitties killed and ate as many as 135 railway workers.

Chicago's North Park Village was once the largest municipal sanatorium in the country.

Former meatpacking facility turned vertical farm and sustainable business complex.

A European-style bath house in Chicago.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

Pizza with a side of fine art.

Chicago's museum dedicated to the history of bondage and fetishism is more textbook than titillation.

This historic hotel invented the chocolate brownie.

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

Years of archaeology, just chillin' by the water cooler.