Mega-giantesses are characterized by being large enough to destroy buildings with simple steps.
Another cliché that characterizes them is that of being able to bed down directly on cities, destroying all edification with their bodies.
Central Park has a length of about 4 kilometers. This photomontage will not be of professional quality, but at least it serves to give you an idea of how big a mega-GTS is. Obviously, she measures approximately 4 kilometers high (which is near the midpoint of the range where the definition of mega-GTS oscillates). Note, for example, that she with her left hand could collapse several buildings.