>>>>>> Is there anything of interest between OKC and Omaha? <<<<<<<<
I'd recommend starting in and around Bartlesville, OK if you have not yet explored the area. Bartlesville is north of Tulsa on US 60 and was the headquarters for the Phillips 66 oil company. Do not miss touring Frank Lloyd Wright's only finished skyscraper, the Price Tower, http://pricetower.org
. Other sites include the Frank Phillips Home, http://frankphillipshome.org
, and Woolaroc, http://woolaroc.org
. We've stayed at Osage Hills State Park.
From Bartlesville, stay on US 75, a blue highway, and as you are nearing Omaha, you'll find interesting sites around Nebraska City, http://www.nebraskacity.com