Lake Mead National Recreation Area
People seem to like numbers, and hierarchy, so here's a rundown of the leading units of the National Park System in terms of 2011 visitation. The first list combs through all 397 units in the system, while the second looks only at "national parks."
For at least the second time this summer, gasoline fumes are believed to be the culprit in a serious boating incident in a park. Five people were injured in an explosion aboard a boat at Lake Mead National Recreation Area.