[Windflier]

she struck up a conversation with Aldrin and asked him about Apollo 11. He volunteered that he and Armstrong took film and made cursory inspections of alien artifacts near Tranquility Base.

Photo taken of the back side of Luna:

NASA images archive link:

http://www.lpi.usra.edu/resources/apollo/frame/?AS15-P-9625

[SunkenCiv]

Buzz has been trying to develop a sci-fi series about (fictional) alien artifacts at the South Pole, which is what he was apparently talking about, assuming that the conversation wasn’t a fabrication:

http://www.goodreads.com/book/show/687527.Encounter_with_Tiber

I hate to do it, but here’s csicop’s breakdown of the whole “Aldrin saw ET” hoax:
http://www.csicop.org/si/show/ufos_and_aliens_in_space/

Here’s a shorter to the point version, same author, NASA website:
http://sservi.nasa.gov/?question=buzz-aldrins-ufo-sighting