The Great Smoky Mountains National Park. The most visited national park in the country. An incredible sanctaury of mountains, streams, and fog. But way too many drive-thru wedding chapels and trucks with "Just hitched" in the back windshield to find it romantic. Try not to visit on a day in early spring when it's raining.
L: Gatlinburg (shudder) from the bypass; R: View in the park
Now you see why they call them the Smoky Mountains