After further research I am wondering if those lines are this
http://en.m.wikipedia.org/wiki/Lake_Makgadikgadi
I get mad at my brother who buys into ancient aliens and similar crap. They put together this seemingly cogent line of thinking with seemingly infallible facts. The problem is they often either outright lie or stress the facts. Lime Pumapunku. They state its 12000 years old and could only be carved with a laser. Its actually 1200 years old and made out of red limestone, which doesnt even need metal to carve.
Puma Punku is a pretty astounding site. I’d love to know how the locals did it but they’re gone now.