Perhaps Bowdoin's most impressive alum, Joshua Lawrence Chamberlain, is buried in the Brunswick Cemetary next to Bowdoin College.
When the Civil War broke out, Chamberlain, then a professor at Bowdoin, asked the administration for a sabatical so he could join the war. The administration refused his request so he instead asked if he could get a sabatical to study in England. This the administration granted, so Chamberlain then snuk out and joined the Union army anyway!
Chamberlain was shot six times during the war, led a heroic charge up Little Round Top at Gettysburg, earned the Congressional Medal of Honor, and was chosen by Grant to accept Lee's sword at Appomatix.
After the war, Chamberlain went on to become Governor of Maine and President of Bowdoin, but at the end of his life died relatively destitute.
Chamberlain's grave is sadly, pretty unimpressive. I think he deserves a far greater tribute. These pictures are more of the area around his grave than his grave itself for that very reason.