I hope the link will work OK. I received the link from a relative

Here are twelve phenomenal photographs from the Civil War era, superimposed with photographs of the same scenes as they appear today. Photos #1 (Antietam); #3 (Slave Auction House); #6 (Devil’s Den); #7 (Evergreen Cemetery); #9 (US Capitol); and #10 (Ford’s Theater) are especially remarkable because you can clearly identify the original architecture. History fans will especially enjoy these pictures.

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You can switch between the then and now photos by dragging the white dot to the left or right...

http://www.theguardian.com/artanddesign/ng-interactive/2015/jun/22/american-civil-war-photography-interactive