There is a tradition of giant sculpture in the US with examples that date back to the begin of the 20th Century. Some are quirky and strange, some are huge adverts or signs visible over long distances on the highways advertising businesses, hotels, cafes etc.
http://www.roadsideamerica.com/set/coffee.html
http://watertowers.tripod.com/
http://www.yorklib.org/local/artistic-water-towers