On this day: December 18

POSTED: 10:51 PM PST Dec 17, 2012    UPDATED: 11:00 PM PST Dec 17, 2012 

America celebrates its first official day of thanksgiving, "The Nutcracker" debuts, the first "Pink Panther" short premieres, the first nuclear power plant in America goes online, all on this day.

OTD December 18 - Cliff Palace
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Public domain

1888: Richard Wetherill and his brother in-law, Charlie Mason, discover the ancient Indian ruins of Cliff Palace in Mesa Verde, Colo. The structure, built by the Ancestral Pueblo peoples, is the largest cliff dwelling in North America.

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