Any suggestions for an ideal but scenic route, North Dakota to Greensboro, Tennessee?

[Sappling]

We live in North Dakota and are planning our first trip across country together as a couple. We would like to make decent time,but see and experience a lot of great things along the way.Any suggestions, or must sees along the way?

[Lifemagician]

Hi, and welcome to the Great American Roadtrip Forum.

First you will need to tell us some more.

How much time are you allocating for this trip?
When will this trip take place?
What are your interests.
What is the purpose of the trip?

Lifey