Woodhenge

Historical marker location:

Collinsville, Illinois

( Marker is on Collinsville Rd, 0.4 miles west of Sand Prairie Rd, on the right when traveling west.)

A prehistoric solar calendar.

The Illinois State Police, founded in 1922, is one of the oldest state police agencies in the United States. The agency is responsible for enforcing state laws, protecting state property, and providing security for the governor and other state officials.