A Corinthian helmet that was found in Greece in 1834 still containing the scull of its wearer. It's believed to date from the Battle of Marathon which was fought between Greek and Persian forces in 490 BCE. This battle gave rise to the legend of Pheidippides, the Athenian messenger who ran throughout Greece to warn of the impending battle, a feat that the modern marathon is based on.

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Floyd Mayweather Jr (left) Vs Manny Pacquiao in their 2015 welterweight bout which Mayweather won in a unanimous decision. 

A Native American archer, probably from the 1880s. His bow appears to be a self-bow, i.e., made from one piece of wood
and his 1883 US Army shirt and woven canvas cartridge suggest he may have been a scout.

Source: truewestmagazine.com