You can't make this stuff up, I swear!
billion
Every read "Forbidden Archeology"? Loaded with actual dig sites that date long before humanity was supposed to be bopping around Momma Terra. One was a mine that found stone tools under a lava flow that was a few million years old. Another was a metal sphere found in Africa. Basically a ball bearing with a ridge around the equator. It carbon dated at over a years old!It just begs for a "those who came before" story arc.
everyone here has probably already seen this, if so sorry but sparked several ideas for me http://www.cracked.com/article/181_the-6-creepiest-places-earth/
The doggie death bridge is what bothered me the most. Mysterious abandoned cities and crazy-lady architecture doesn't hit me the same as K9's trying for instant evolution.The double jumpers are even more baffling.