Don’t forget to check out Doors Open Denver this weekend. There are over 80 buildings to choose from, all offering free self-guided tours. Registration for Expert Tours will be held at the DOD Headquarters located at Union Station from 8:30 am-4 pm this Saturday and Sunday, April 17th and 18th. You can download a Site Map along with the corresponding numbered Site List before you go. If you can’t decide which buildings you want to visit, Urban Adventures will direct you to various themed tours.