St. Louis is well known as or commonly referred as the 'Gateway to the West.’ Gateway Arch National Park Facts * A Finnish-American Architect Won A Nationwide Competition To Design The Famous Arch. * A 19th Century St. ... * There's A Square That's Also Named After The Same 19th Century Lawyer. * The Arch Is The Tallest Artificial Monument In The U.S. * The Gateway Arch Weighs 43,220 Pounds. Ciation (gave credit to google) lol