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

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

An actual 1957 Cadillac De Ville, encased in 15 cubic yards of concrete.

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

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

The original Garfield station is the oldest station facility on the "L", with the station house dating from 1892.

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

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

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

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

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

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

Over 1,000 pieces of one of the most niche art objects imaginable: the glass paperweight.

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

A military museum and library dedicated to the citizen soldier.

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

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.

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

In Chicago, a pizza-enthusiast has opened a museum dedicated to the history of pizza.

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

This museum celebrating the almighty dollar lets visitors literally stand in the shadow of a million bucks.

Illegal drag racing two stories beneath Chicago’s streets.

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