Allan Pinkerton

Historical marker location:

4001 North Clark Street, Chicago, Illinois

( Marker is on Center Avenue, on the right when traveling north.)

Graceland Cemetery, Chicago IL.

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.