Ontario holiday destinations rivalling Hallmark movie sets can be found throughout the province, but few scenic locales rival the picturesque charm of the historic Unionville area of Markham, Ont.Unionville's historic small-town architecture creates the perfect backdrop for your own little Hallmark movie winter wonderland, while its artisan shops, diners, and boutiques — all decked out for the season in twinkling lights and tinsel — add to the town's holiday charm.If you're planning a trip to Unionville, which proudly calls itself "the holiday town,"  Main Street is absolutely worth a stroll, with impressive holiday decorations lighting the way.    View this post on Instagram           A post shared by Megan | thatgirlwithpinknails (@thatgirlwithpinknails)Celebrations kick off with the Old Tyme Christmas event, featuring a lighting ceremony, a ca...