Best National Parks for Admiring "Rock Art"

There are a handful of places in the National Park System where you can view petroglyphs or pictographs. Some are walk-up panels that you can ponder for hours, others require a float down a river or a long hike. Here's a quick look at some of those units and what you can expect to find.
- By Kurt Repanshek - May 14th, 2010 2:23am