Doors Open Denver 2010 is this Saturday and Sunday from 10-4. This great event celebrates architecture and design of some of Denver’s most interesting buildings. DOD is a free event put on by the Denver Office of Cultural Affairs and Denver Architectural Foundation that lets residents explore buildings that they see every day and have never entered. You can do a self-guided tour or an expert tour led by a volunteer guide. To sign up for an expert tour you must go to Union Station and pre-register. More than 85 sites will be included in the 6th year of this wonderful event including Civic Center Park, Denver Firefighters Museum, Tattered Cover, Taxi I & Taxi II and Union Station. To learn more click here.