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

First planned industrial community in the United States.

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

An antiquated German apothecary on Chicago's North Side.

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

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

This cheerfully-named branch of the Chicago River is the fetid result of years of blood, entrails, and meatpacking waste.

Landmark Chicago building narrowly avoided destruction.

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

An abandoned stretch of highway, deteriorating next to the operational one.

What appears to be a wizard's lair in Milwaukee actually houses a massive water pipe.

This historic hotel invented the chocolate brownie.

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

Huge abstract sculptures of the Puerto Rican Flag.

Built to house a chapter of the Knights Templar, this grandiose building is a relic of Freemasonry in Chicago a century ago.

Steepest flood safety railway in the entire world.

Memorializing an American tragedy of massive proportions.

This dramatic rail curve was once the target of a failed Nazi attack.

Behold the rickety wooden glory of the world's oldest operating roller coaster.

Designed by Alfred Caldwel, this landscape showcases his vision of a native garden.

The faint remains of a Polish news empire still linger.

Hot Doug's "Hot Dog" Stand.

An eccentric park and pool.

A Chicago Movie Palace Lost to Time.