The Chicago Architecture Foundation does a nice guided tour of the pedway: https://www.architecture.org/experience-caf/tours/detail/chicago-pedway/ https://www.

The Chicago Architecture Foundation does a nice guided tour of the pedway: https://www.architecture.org/experience-caf/tours/detail/chicago-pedway/ https://www.architecture.org/experience-caf/tours/detail/chi... I've done it before and it's a great way to see Chicago in the winter when it's silly cold outside.