Trick-or-treating—setting off on Halloween night in costume and ringing doorbells to demand treats—has been a tradition in the United States and other countries for more than a century. Its origins remain murky but traces can be identified in ancient Celtic festivals, early Roman Catholic holidays, medieval practices—and even British politics.

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• Did you know all this information? Do you celebrate (or have you ever celebrated) Halloween? Is it more for kids or can adults also enjoy it? Please leave your comments below!