Once known as the Illinois Asylum for the Incurable Insane.

A sprawling outdoor museum filled with larger-than-life works of art.

A massive bur oak tree believed to be some 500 years old is the centerpiece of this quiet urban greenspace.

Display that gathers the basic elements of the universe in one convenient location.

A collection of 11 million buttons illustrates the human toll of the Holocaust.

This national park dedicated to the tallgrass prairie ecosystem still displays its military past.

One of two identical monuments marking the sites of military training encampments in Peoria, Illinois.

The world's largest collection of the world's largest objects is in one small Illinois town.

A unique outdoor timepiece at a "clothing-optional" resort.

The legacy of an unsolved, gruesome murder rests beneath the spans of this historic bridge.

A Depression-era sculpture by Charles Umlauf survives in a small suburban post office.

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

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

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

An antiquated German apothecary on Chicago's North Side.

This rare female version of the Muffler Man has its clothes removed each summer to signal the start of pool season.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.

This grave in a ghost town cemetery marks the death of a witch on a day that never happened.