Chicago's North Park Village was once the largest municipal sanatorium in the country.

The world's only known button museum.

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

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.

A shining sculpture made of 3,115 lights, the number of visible stars in the Northern Hemisphere.

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

Chicago's museum dedicated to the history of bondage and fetishism is more textbook than titillation.

These abandoned grain silos and tunnels are an urban exploration dream.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Nonprofit art center that promotes outsider, intuitive, and self-taught art.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

The subtle science of a master molecular gastronomist.

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

An enormous park-like oasis, full of famous Chicagoans' graves.

An antiquated German apothecary on Chicago's North Side.

A monument to the art of slicing people open.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

A lush green oasis in the middle of Chicago.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

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

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

This abandoned school has had many lives since the early 1900s, and all of them doomed.

This former fire tower is now a rustic observatory that offers amazing views of eagles, hawks, and the Appalachian Mountains.