To kick this off, I have found a great one: Robert Stephenson Smyth Baden-Powell, 1st Baron Baden-Powell, who on January 24, 1908 founded the Boy Scout Movement!
I had many great experiences myself in Scouts, including two trips (1987, 1988 Rayado) to Philmont Scout Ranch. If there is one regret of my adolescense, it's that I didn't quite make it to Eagle Scout.
The contributions of Scouting to our world, in the development of leaders, and the building of individual character in young men is without question.
The Scout's Oath: On my honor, I will do my best to do my duty to God and my Country; to obey the Scout Law; to help other people at all times; and to keep myself physically strong, mentally awake, and morally straight.
The Scout Law: A Scout is trustworthy, loyal, helpful, friendly, courteous, kind, obedient, cheerful, thrifty, brave, clean, and reverent.
And yes, I can still do the oath and law from memory! Both the Boy Scouts of America and the World Organization of the Scout Movement are being placed under "Sites on My Mind".
Lord Robert Baden-Powell, establishing the Scouting movement was your finest hour!