ROBERT SIEGEL, host:
As if one Lincoln mystery weren't enough. Today we have two. The second begins with a photograph that belonged to the man largely credited with helping Lincoln win the Civil War, Ulysses S. Grant. General Grant's great great-grandson recently stumbled across the picture in a family album. It's a picture of the White House taken in 1865. But what's remarkable about the shot is not the building, but the man standing in front of it. Historians think this could be one of the last photos taken of Abraham Lincoln before his death. There's just one problem. It isn't clear that the man is in fact Lincoln.
He is tall, that's for sure. And he appears to be sporting a beard and wearing a black frock coat, but is it our 16th president? Well, you decide. You can find the photo at our Web site npr.org.