The last remnants of a lakeside airport that was bulldozed overnight by the mayor of Chicago.

How did a 2,000-year-old Roman column find its way to a Chicago park?

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

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

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

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

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

People escaping slavery passed through the oldest house in Lombard, Illinois on their northbound journey to freedom.

The tunnel that runs beneath this former inn was once a hiding place for enslaved people seeking freedom.

Over 100 million years ago, beach-bound dinosaurs left permanent marks on San Antonio's landscape.

This deceivingly ordinary warehouse hides an enormous collection of pop culture treasures.

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

Shop of curiosities with a dinosaur museum tucked in its basement.

A onetime gangsters' hideaway where you can dine on steaks, fine wines, and cigars just like they once did.

World's second largest particle accelerator, where nature reveals its secrets.

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

Burial mounds of prehistoric Native Americans who lived along the DuPage River.

Cold War missile launch site which has been converted to a public park.

Take a break from all the boring business of death at this funeral home mini-golf course.

Its eclectic exhibits range from the world’s first motorcycle to Luke Skywalker’s Land Speeder.

Former meatpacking facility turned vertical farm and sustainable business complex.

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

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