They were pyramidal in shape and truncated, and the larger, which Ned surmised to be anywhere from 500 to 1000 feet square, seemed to rise to a height of two or three hundred feet.

The other was about two-thirds the size of the larger, both in area and height.
Although there was much vegetation clinging about them Ned knew that these were pyramids erected by the hand of man.

The feeling that this was a land old like Egypt came back to him most powerfully in the presence of these ancient monuments, which were in fact the Pyramid of the Sun and the Pyramid of the Moon.

There they stood, desolate and of untold age.

The setting sun poured an intense red light upon them, until they stood out vivid and enlarged.
So far as Ned knew, no other human being was anywhere near.