Exactly six years ago today, this was the status of the Denver Union Station transit project (click/expand to view in full 2400 px width):

On June 1, 2010, excavation was in full swing on the western half of the underground bus concourse. Visible in the center of the photo behind the historic station is the old light rail station, mall shuttle terminus, and Amtrak platforms. A temporary support wall is in place along the edge of Wewatta Street. (Note how HUGE that dirt pile is by comparison to the workers on top of it!)

This was approximately the 6-month mark of construction on the 54-month Union Station project.