Roses and Remembrance was held on the 9th anniversary of Muhammad Ali's death at the boxing legend's gravesite in Cave Hill Cemetery - where visitors were given the chance to reflect on Ali's impact ...

FILE - In this May 25, 1965, file photo, heavyweight champion Muhammad Ali stands over fallen challenger Sonny Liston shortly after dropping him with a short hard right to the jaw in Lewiston, Maine.

When Muhammad Ali knocked down Sonny Liston on May 25, 1965, a 22-year-old photographer named Neil Leifer was ringside. Decades later, the image he captured still has our attention.