Charles R. Walgreen Sr.

Historical marker location:

111 S Halsted St, Chicago, Illinois

( Marker is on Halsted Street, 0 miles north of Adams Street, on the right.)

Marker installed: 2000

The state of Illinois played a crucial role in the Underground Railroad, a network of secret routes and safe houses used by slaves to escape to freedom in the 19th century. Many abolitionists in Illinois provided safe houses for escaping slaves, and Chicago was a key hub on the Underground Railroad.