An artificial crater field that trained astronauts for lunar exploration.

A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.

Visitors to this public park will also find the ruins of an old western fort.

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

Wisconsin's most celebrated export gets the royal treatment on I-94.

A river with some unusual, and occasionally dangerous, habits.

Urban explorers embraced America's now demolished first suburban mall, south of Chicago.

The young Black revolutionary was killed before getting to see a non-segregated pool in his hometown.

This elaborate Hindu temple is located in a Chicago suburb, but looks like it was transported directly from India.

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

This botanical garden outside Chicago boasts an array of more than 300 varieties of lilacs.

Cemetery featuring rare glass-fronted columbarium.

A plaque marks a former safe house on the secret route, now hidden next to a McDonald's.

This sprawling mini-golf empire is an impressive testament to a disappearing attraction.

The face of a woman pushes its way through the earth.

Grand opera on a miniature scale.

A mini Wrigley Field for mini baseball players.

The city of Rockford, Illinois is symbolically protected by a quartet of fittingly stony sentinels.

This historic Illinois "Muffler Man" has been converted from axe-touting lumberjack to rocket-wielding space ace.

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

This architectural stunner is one of the few surviving Egyptian Revival theaters in the U.S.

This cemetery is all that remains of a school for "wayward" girls.

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

A hidden grotto on the grounds of the Kane County Government Center.