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Sorry, but the western ends of both Massachusetts and Connecticut (as well as their coastal areas) merit a bump way up the list. The mountains, rocks, rivers, and mature human settlements are pretty remarkable in that region.
Rhode Island has its coastal plain that is similar to the same plain that extends all the way from Texas, (piney woods, sandy ground, little elevation change), but when you get over to the Jamestown, Newport area it blows you away.
Kansas on the bottom is just kinda cliche. I left Dallas one afternoon and headed north across The Nations of Oklahoma (also a state with more beauty than many realize) and wound up wondering around the newly planted grove of trees at the Okie City Memorial (wow!) at dusky dark, only to stop for the night just barely over the Kansas border along I-35. (First time I ever bought beer from a vending machine.)
Cold as a witch that night... I tore out very early the next a.m. and experienced an amazing sunrise between Wichita and Emporia in the grasslands. There were no other vehicles around me and I dropped down to about 45 mph just soaking in the rolling hills, grasses blowing in the breeze, and a sky full of color that accentuated the lack of humanity around. One of my all time favorite hours... Strange as it seems, I thought western Kansas along I-70 was a hauntingly beautiful drive as well.
There is beauty in every piece of ground, but not everywhere gets a postcard.Those who downplay the Midwest were often in such a hurry to get elsewhere that they missed a good show.