Share article to Established by Henry H. Zietz in 1893, the Buckhorn Exchange is Denver's oldest operating restaurant. It is well known for its steak and game meats. Location: DenverPlace: Denver MetroMap: Image by: Beall, JeffreyDate: May 2009Source: File:BuckhornExchange.JPG - Wikimedia CommonsCopyright Notes: Image courtesy of Wikimedia Commons.