Author: Brian Holmes Published: 7:41 PM MST December 21, 2016 Updated: 7:47 PM MST December 21, 2016 RUPERT, Idaho - A lot of Idaho cities have nicknames - from the City of Trees to the Gateway to Yellowstone - but only one can lay claim to the Christmas holiday. Rupert, also officially known as "Christmas City" by the State of Idaho, has been going all-in on the winter holiday for decades.      Since the town's beginning's at the turn of the 20th century, residents have put a special focus on decorating Rupert Square for the Christmas holiday.