Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

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

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

A lush green oasis in the middle of Chicago.

Partially submerged Buddha heads freckle Chicago’s neighborhoods.

This shop for all your super spy needs hides an educational secret.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

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

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

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

This historic hotel invented the chocolate brownie.

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

This railroad and oil tycoon's lavish estate now stands as a time capsule of the Gilded Age.

Electrical pylon in the shape of Disney's beloved mouse.

A Circus legend leaves an unexpected endowment.