These ancient cliff dwellings, found in Mesa Verde National Park, Colorado, were seasonally inhabited by a group of nomadic Paleo-Indians for nearly 900 years. They were built between A.D. 450 and 1300. These dwellings are at an altitude of about 8,530 feet, nestled almost perfectly into the cliff, with more than 4,000 known archeological sites within this area.

Mesa Verde National Park, Colorado

These caught my eye because of how intriguing the idea of building things in a cave on the side of a cliff is, but also because people could transport materials into this place. The ruins may not be the most grand or extravagant, but I think the innovative techniques that had to have taken place to make this possible are quite unique. 

I also think that this is a new way of looking at how people used to live and how people used to adapt to their surroundings. A big architectural concept is deciding whether to follow and work with the site or to work against it. I think this is a great example of architects at the time deciding to work with what they had and to create something that fit perfectly into the side of these cliffs.