This is a pedestrian tunnel under Route 66.

Built in 1937, this tunnel was needed because the large amount of traffic on Route 66 made it difficult and dangerous for pedestrians to cross. Locally, this tunnel became known as the "subway."

The entrance to the tunnel was sealed in the 1950s.

In the Spring of 2006, the Route 66 Association of Illinois restored the railing and the first three steps on the east side of the street.