Coolidge was born on the Fourth of July, the only President to achieve that feat.
I've seen his grave in Vermont--very simple with nothing saying he was President (there is a Presidential seal on the grave marker but you have to know already what it is to know that). When I saw it several years ago it looked too fresh to be the original stone from when Calvin Coolidge died--maybe someone had vandalized or stolen the original.
Did he plan to be born on the 4th of July and did he know he was going to be president?