Natchez Trace Parkway
Annual visitors: 5.8 million
Location: Mississippi to Tennessee
Size: 444 miles
Founded: 1938
Highlights: The Old Trace path was used by Native Americans and settlers, and now visitors can experience it via driving, hiking, biking or horseback riding. History buffs will also enjoy the Tupelo National Battlefield and Brices Cross Roads National Battlefield located along the path near Tupelo, Mississippi.