Around Four Corners - where New Mexico, Colarodo, Arizona and Utah meet:
Mesa Verde - Indian ruins - national park
Monument Valley - someone posted a picture
Canyon De Chelly - don't have word to describe it. must go!
Chaco Canyon, Chaco Culture National Historical Park - "Containing the most sweeping collection of ancient ruins north of Mexico, the park preserves one of the United States' most important pre-Columbian cultural and historical areas."(wiki) Today is the best day of the year to visit!
start about now, take a ride from Cortez to Telluride, the view is breath taking!
then you got all those national parks in Utah - Canyonland, Arches, capital reef...