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

The palatial McDonald's that inspired Wesley Willis.

Assemble a masterpiece at the first and only North American school exclusively dedicated to mosaic art.

This historic hotel invented the chocolate brownie.

Hidden on the 7th floor of a historic building, this Cajun spot features wall-to-wall bottles of hot sauce.

A military museum and library dedicated to the citizen soldier.

The iconic Chicago sculpture hides a beautiful and easily overlooked plaque on the backside.

The site of the first couple's first kiss is commemorated by the most adorable presidential monument ever.

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

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

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

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

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

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

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

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

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

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

No one knows how many bodies are in this vault in a Chicago public park.

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

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

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

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.