If your interested in photographing ancient Native American ruins the four corners area of Utah, Colorado, New Mexico, and Arizona is a great place to start. Mesa Verde in Colorado was the first place I visited about 30 years ago. Mesa Verde is a National Park and was established on June 29, 1906. It was discovered in the late 1800"s and much of it was plundered before archeologist could come in and review it. The area was inhabited by the Anazasi Indians or what is now called Ancestral Puebloans. It is felt that they inhabited the area for more than 700 years.(550A.D. to 1300 A.D.) Currently Mesa Verde has over 4,700 archaeological sites including 600 cliff dwellings. These sites are some of the most notable and best-preserved dwellings of there kind. Two other sites I would recommend is Hovenweep and Betatakin.
Once you get the bug you might want to venture out and discover some of the less known ruins on your own. Who knows you might discover one that hasn't yet been identified. I have hiked through several of the canyon area's in Utah. The red sandstone dwellings blend into there surroundings and you can walk by them without seeing them if your not carefully scanning the cliffs. Along with many of these dwellings are ancient artwork called Petroglyphs its such a thrill to discover them. Usually you are alone and with nature as you venture back into these areas. Just sit and listen calling on your imagination as to what must have been going on back in ancient times.
If interested in going out on your own Google cliff dwellings or Anazasi ruins to get a start and go from there. If you decide to go out on your own please be respectful of the area and be prepared with a day pack and the necessities required for hiking. These ruins are very fragile so please step lightly and use good judgment. Please make sure that you don't remove anything from these ancient sites.
Have a great trip and be careful out there.