1. The Cassius M. Clay Battery defending the White House in 1861

2. The railroad engine "Gen Haupt" at the Alexandria Roundhouse.

3. The Old Trinity Church with the United States Capitol Dome under construction behind it.

4. Brig. Gen. Gustavus A. DeRussey (third from left) and staff on portico of Arlington House

5. East front of Arlington House (General Lee's home), with Union soldiers on the lawn, June 28, 1864

6. Front view of the Virginia State Capitol Building in Richmond, VA

7. A lone grave on the battlefield of Antietam (Sharpsburg)

8. A group of Federal soldiers at the Appomattox Court House after the surrender of General Lee's forces.

9. Clover Hill Tavern at Appomattox Court House after the surrender of General Lee's forces.  It was here inside this tavern that 28,231 parole passes were printed and issued to Confederate soldiers permitting them to return home undisturbed. 

10. An explosion inside of Fort Sumter
An explosion inside of Fort Sumter.  It is interesting to note that this was the first time in history that an explosion was captured by a camera. 

11. Confederate dead near the Dunker Church at Antietam (Sharpsburg), MD 

12. General McDowell and his staff on the steps of Arlington House 

13. Former slaves collecting bones of soldiers killed in the Battle of Cold Harbor over a year after the battle was fought.

14. Officers of the U.S. Treasury Battalion posing in front of the uncompleted Washington Monument in Washington, D.C.

15. The O'Connor house (180 Broad Street), where Federal officers were confined under fire in Charleston, SC

16. The prison camp at Belle Isle in Richmond, VA  (You can see the Capitol building in the background)

17. The Old Dorm at the Lutheran Theological Seminary at Gettysburg
The Old Dorm at the Lutheran Theological Seminary at Gettysburg.  The cupola of the Old Dorm served as an observation tower first for Union and then for the Confederate officers. From that day and for two additional months, the rest of the building served as a hospital for the wounded from both sides.

18. View at Trostle's barn in Gettysburg where the 9th Massachusetts Battery was attacked.

19. General Hancock's Veteran Corps on F Street, N. W. Washington, D. C
General Hancock's Veteran Corps on F Street, N.W. Washington, D.C. 1st U.S. Volunteer Infantry

20. View of Harper's Ferry from across the destroyed railroad bridge