Challenge page : http://www.ancientsocieties.com/destroy/
The challenge text says Vanishing point.
When zooming in the windshield, you will find GPS coordinates : 34.121331 -118.314337
Theses coordinates send you to Bronson Canyon in Google Maps, just typing in the coordinates.
Search Wikipedia, you will find this page http://en.wikipedia.org/wiki/Bronson_Canyon
Reading the wiki page, one reference is interesting, “The most well known appearance of the tunnel entrance is likely as the entrance to the Batcave in the Batman television series of the 1960s.”
Let’s try some names from that page…
The solution page is http://stl.la/batcave, this page is redirected to http://www.ancientsocieties.com/ten-miles-east/