The Chicago Historical Society has put together a terrific website on the Great Chicago Fire. Several essays provide an interesting overview while a collection of images and primary sources allow for a more thorough exploration of the event. The O’Leary legend is discussed in fascinating detail.
This fun little site takes a hard-hitting look at the charges leveled at Daisy. Photos of the O’Leary home and a diagram of the crime scene are provided, as well as an alternative explanation of events.