Our ancestors were so much smarter than that. They built out of stone. And away from the forces of weather and erosion. No wonder their descendants are so enamored with Kim Kardashian.
These people (the scientific term is "Ancestral Puebloans" - a full-on vowel train wreck) were amazing. Granted, they spent the majority of their day grinding corn into corn meal by hand with a rock, but their architectural designs were ingenious. In the line of evolution they arrived long after the cave men, but they literally lived in caves. If anything, we have devolved since 600 A.D.
Although it would have been nice if they hadn't decided to live so far off the highway.