A recent internet hoax played up the giants among us theme with some patently unbelievable images. They suffer from the 'Godzilla Syndrome' - being so huge it is impossible to suspend belief long enough to wonder if they really did exist.
However, through history, there have been alleged findings of larger than normal skeletons which might bear more study. A list here.
Giantism is not an unknown condition, as well, and some people groups tend to be very tall, slender limbed, and with fine features while others tend to be shorter, sturdier, and heavier bone construction (Big bones run in the family, right?).
With recent research claiming all people with non-African genetic background are desceneded from the Net