<human>:  When was the Natchez Trace Parkway built?
<bot>: The Natchez Trace Parkway was built in the 1930s. It was built to help preserve the natural beauty of the Natchez Trace Parkway. The Natchez Trace Parkway was named after the Natchez Trace, which was originally a Native American trail that was used for trade routes between the eastern and western parts of the United States. The Natchez Trace Parkway is a part of the National Park Service and is open to visitors.