On this day: October 31

Published On: Oct 31 2012 12:59:09 AM EDT   Updated On: Oct 31 2013 02:00:00 AM EDT

The first All Hallows' Evening is celebrated, Nevada becomes a state, Harry Houdini dies, Mount Rushmore is completed, and the Vatican apologizes to Galileo, all on this day.

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A.D. 834: The evening of Oct. 31 becomes All Hallows' Evening (which would be contracted to Hallowe'en or Halloween over the years) when Pope Gregory IV moves the feast of All Saints from May to Nov. 1, followed by a day in honor of soon-to-be saints, the feast of All Souls.