An Atlanta man has visited all 39 presidential gravesites. He paid his respects to Jimmy Carter this week

Michael Tropp has met seven presidents and visited all 39 presidential gravesites. This presidential history buff just paid his respects to Jimmy Carter.

​ Michael Tropp has met seven presidents and visited all 39 presidential gravesites. This presidential history buff just paid his respects to Jimmy Carter. Read More Breaking News, Latest News and Videos | CNN