Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

With 8,000 pipes this giant instrument is the most versatile theatre pipe organ ever built.

A onetime gangsters' hideaway where you can dine on steaks, fine wines, and cigars just like they once did.

The remains of a Rockefeller's lush Italianate estate hidden in the underbrush on the coast of Lake Michigan.

First planned industrial community in the United States.

The final resting place of the world's first nuclear reactor.

Take a break from all the boring business of death at this funeral home mini-golf course.

This sprawling mini-golf empire is an impressive testament to a disappearing attraction.

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

This botanical garden outside Chicago boasts an array of more than 300 varieties of lilacs.

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

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

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

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

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

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

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

This historic hotel invented the chocolate brownie.

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

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

A gothic church spire sits atop this skyscraper, the tallest church in the world.

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

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

A century-old network of freight tunnels underneath the city's historic business district.