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

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

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

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

What was once one of the country's largest confectionary plants is now an abandoned ruin, but is still pretty sweet.

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

Location of the Real World's disastrous, and protested, eleventh season.

A bloodstain from "the wound of the transverberation of the heart."

This awkward aquarium sculpture is one of the strangest statues in Chicago.

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

Where Cusack's record store from the film "High Fidelity" was located.

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

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

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

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

All of Chicago's wood-paved streets are long gone but two alleys remain.

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

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

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

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