This surprising gem is a world-class archeological museum hidden at the University of Chicago.

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

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

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

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

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

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

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

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

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

A hollow cement depiction of time's inexorable effect on the human body.

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

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

Said to be haunted, this tower was constructed by a sugar importer as a gift to his wife.

A lush green oasis in the middle of Chicago.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

This abandoned psychiatric hospital once housed more than 4,000 patients in the middle of a quaint New England town.

This former asylum for Black Americans is haunted by its history of violence and racism.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

An abandoned asylum where patients have been forgotten but their possessions remain.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

A real flying saucer, contracted by the U.S. Air Force.