The formal library of Mayslake Hall is an intimate 80-seat theater. Mayslake Hall is a 30-room Tudor Revival style mansion originally built by coal baron Francis S. Peabody. Completed in 1922, the mansion is on the National Registry of Historic Places and is currently in the process of being fully restored. Tours of the mansion and the restoration in progress are offered every Wednesday and Saturday mornings by the Forest Preserve District of DuPage County.

The Mayslake Peabody Estate is nestled in this beautiful preserve surrounded by wetlands, lakes and ponds, prairies, marsh and savannah as well a replica of the Portiuncula Chapel of St. Francis of Assisi, where ceremonies are held throughout the year. The estate is also home to the 39-room Tudor Revival style mansion Mayslake Hall that is currently open for public tours.

The history of the site dates back to prehistoric times. Two archeological sites are located on the grounds, and the property was also inhabited during the Potawatomi Native American era. Special emphasis is placed on the representation of the life and time of the Peabody family and staff in the early 1920s, highlighting the architectural design of Benjamin Marshall. Also volunteers at the site will present the history of the Franciscan Order of the Friars Minor who operated a retreat at Mayslake Peabody Estate.