Klaus Dona, who seems to be an under-regarded scholar of fringe archaeology, has published images of what appears to be a female figure of staggering proportions carved into the side of a granite cliff in Guinea, West Africa. He claims its height is 150m, which is roughly equal to that of the great pyramid. A google search reveals scant details about this thing, and I would be interested to know if anyone else here has heard of it.
http://projectavalon.net/Klaus_Dona_2_html_m15293afd.gif
(The host page is http://projectavalon.net/lang/en/klaus_dona_2_interview_transcript_en.html )