Saturday Sky: More Mexican Memories

The entrance to Las Grutas de Garcia, the caves we visited in Mexico, is from a ledge on a cliff face on one side of a valley framed with the spiky mountains we saw everywhere there. The landscape is totally different from any other I've ever seen. As far as we could tell there was no natural water at all in this valley. I should have asked someone about the perfectly conical peak rising from the valley floor: it looks like it would have to be volcanic, but what do I know?