(Photo: National Park Service)
Great Smoky Mountains National Park, North Carolina and Tennessee
There are about 100 native tree species in America's most-visited national park, most of which turn kaleidoscopic come fall. Changing leaves are complemented by autumn wildflowers: delicate asters and other varieties furnish pops of color.
When to Go: Get weekly reports on the state of local foliage on the National Park Service website.