Graue Mill, History museum in Oak Brook, Illinois.
Graue Mill is a four-story gristmill in Oak Brook, Illinois, built from limestone and local brick, driven by a wooden waterwheel on Salt Creek. The mill building now operates as a history museum where the original grinding stones and waterwheel mechanism can be seen in working condition.
Friedrich Graue, a German immigrant, built the mill in 1852 using limestone quarried in Lemont and bricks made from local clay. The mill stopped operating commercially as steam-powered alternatives took over, and it was later restored and listed on the National Register of Historic Places.
The mill was part of the Underground Railroad, and visitors can see the spaces where people sought shelter on their way to freedom. The building's dual role as a working mill and a refuge gives it a meaning that goes beyond grain processing.
The mill sits beside Salt Creek and is easy to reach on foot from the surrounding park. Visiting during the warmer months gives you the best chance of seeing the waterwheel turning and joining a guided tour of the working mechanisms.
Friedrich Graue is one of the few documented individuals in Illinois known to have actively sheltered people escaping slavery through the Underground Railroad. The mill is therefore one of a handful of surviving buildings in the state where this chapter of history can still be experienced in place.
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