On this day: July 1

Published On: Jun 28 2013 03:06:05 PM CDT   Updated On: Jul 01 2014 01:00:00 AM CDT

The Battle of Gettysburg begins, America's first zoo opens, the first Tour de France starts, the Sony Walkman hits the market, the PG-13 movie rating is introduced, and the Deepwater Horizon oil spill breaks an unfortunate record, all on this day.

OTD July 1 - Philadelphia Zoo
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Public domain

1874: The Philadelphia Zoo opens as the first zoo in the United States. Chartered on March 21, 1959, it's opening was delayed by the Civil War. It featured 1,000 animals and an admission price of 25 cents when it opened.

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