On this day: October 4

Published On: Oct 03 2012 07:01:41 PM CDT   Updated On: Oct 04 2013 01:00:00 AM CDT

Work begins on Mount Rushmore, Sputnik is launched into space, the pope visits America for the first time, Janis Joplin is found dead of an overdose, all on this day.

OTD October 4 - Secretariat
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Courtesy of Churchill Downs

1989: Secretariat, the racehorse that in 1973 became the first U.S. Triple Crown champion in 25 years and is considered to be one of the greatest Thoroughbreds of all time, is euthanized at the age of 19 after a month of treatment fails to cure laminitis, a painful and often incurable hoof condition.

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