Sir Walter Raleigh is sometimes said to have discovered Angel Falls , but these claims are not considered accurate .
The Falls were not known to the outside world until the American aviator Jimmie Angel flew over them on 18 November 1933 .
Sir Walter Raleigh is sometimes said to have discovered Falls   , but these claims are not considered accurate .
The Falls were not known to the outside world until the American aviator Jimmie Angel flew over them on 18 November 1933 .