Serena Williams, is a sports legend no matter which way you look at it. Her titles are numerous, her feats record-breaking and, according to Forbes, the world's most marketable female athlete who, on several occasions, has been the only woman on their list of one hundred highest paid athletes. But there's certainly a lot more that makes Serena who she is that's been left as The Unknown.
Cristiano Ronaldo, has become synonymous with the sport which made him famous over a career which has, so far, only spanned less than two decades. With Cristiano's astounding amount of media attention, good and bad, he remains one of football's most elusive players, another one of The Unknown.
Colin Kaepernick has made fans and enemies around the world from on simple action - kneeling. While he may now be fighting a legal battle for his return to the field, there's a lot more to Colin's story than what dominates his media appearances, a lot more that has remained The Unknown.