A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

A curious collection of miniatures in a quiet corner of the Chicago Children's Museum.

A monument to the art of slicing people open.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Statue dedicated to the star of an old television show.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

A place to eat for on-the-run agents and espionage enthusiasts.

This striking art museum holds an amazing series of curiosity cabinets.

What may be America's largest classic video game arcade lurks inconspicuously in a Chicago suburb.

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

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

A historic house left in "dramatic still life."

Small and slightly hidden, the American Writers Museum is preserving the legacy of America's finest authors.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

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

The beloved home to all publications indie, erotic, and punky.

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

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

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

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