The structure is believed to have been built sometime in the 8th century CE based upon the dating of several objects found in the ruin. According to Istvan Fodor of the National Museum in Hungary, identification of the structure's purpose is obscured because of the scant amount of evidence of daily human activity at the site. The theories include a fortress, a palace, a monastery, and an astronomical observatory. It is possible, according to Dmitriy Subetto, from the Department of Physical Geography RGPU, that the structure was abandoned prior to completion due to the builders' lack of familiarity with permafrost.Here it is on Google Maps. I found two articles about it at Tuva Online. The images above come from a group of 25 in a photoessay at English Russia.