The tallest man in medical history for whom there is irrefutable evidence is Robert Pershing Wadlow. He was born at Alton, Illinois, USA, on February 22, 1918, and when he was last measured on June 27, 1940, was found to be 2.72 m (8 ft 11.1 in) tall.

Wow that is really tall!! i cant believe its possible for someone to grow that much. it must have been hard getting around, barely fitting in houses.