Union Flag that was flown over Richmond at end of Civil War

This Fall I took a class at the Virginia Historical Society taught by Mike Gorman called How to be a Civil War Photo Geek.  He showed us two versions of this photo.  In one, the flag was limp and one it was perfectly flying in the wind. It took 16 seconds to expose a photo.  It would be hard to catch the flag flying but they didn't get it flying in the other picture.

I also take an American History class at The Virginia Historical Society.  At one of my classes I saw the flag that is in this image!  The flag is on the wall in the museum upstairs near the trolly car.  

The flag has 31 stars.  When the Union captured Richmond in April 1865, it was flown over the Capital building.  If you want to see the flag in person, you can go to the Virginia Historical Society in Richmond Virginia.