R DeWitt Miller's "Within the Pyramid" (short story, first contact): Shhh... aliens sleep here!

A researcher in the jungles of South America finds a pyramid there - a pyramid so big it dwarfs those in Egypt. He also meets another scientist there, one who has known about the pyramid & has a theory about those who built it. We will learn the secrets as one gives the tour of pyramid's interior to the other.

Collected in.

1. Raymond J Healy & J Francis McComas (eds)' "Adventures in Time & Space".

Fact sheet.

First published: Astounding, March 1937.
Rating: B.