[Mr Quatro]

On this day in 1871, flames spark in the Chicago barn of Patrick and Catherine O’Leary, igniting a two-day blaze that kills between 200 and 300 people, destroys 17,450 buildings, leaves 100,000 homeless and causes an estimated $200 million (in 1871 dollars; $3 billion in 2007 dollars) in damages. Legend has it that a cow kicked over a lantern in the O’Leary barn and started the fire, but other theories hold that humans or even a comet may have been responsible for the event that left four square miles of the Windy City, including its business district, in ruins.

http://www.history.com/this-day-in-history