[mjh: Intentional reburial of ruins. I knew it is done, but didn’t realize it has been done a lot at Chaco lately. Follow the link and compare the two photos.]

NPS Archeology Program: Research in the Parks

“Intentional site reburial is an effective, practical, and economical treatment for the most threatened structures with the greatest visitation and is a sustainable and relatively low-tech solution to some of the more complex structural problems”

http://www.nps.gov/archeology/sites/npSites/chacoReburial.htm