When on Google Earth 18 Results

Lindsay Allen is our winner of WOGE 18 with the correct answer of Ani, major period of occupation, 9th to 14th centuries CE.

For some images of the site, see:

http://www.panoramio.com/map/#lt=40.5075&ln=43.572778&z=0

Called the "City of Forty Gates" and "City of One Thousand and One Churches," some estimate the city's population at 100,000 to 200,000 at its height. Ani served as the seat of the Armenian Bagratuni dynasty and from the reign of Ashot III (961) reaching its height under Gagik I (989–1020) when the Armenian Catholicos relocated there. In the next few centuries, the city was captured by Byzantines, Seljuk Turks, Georgians and Mongols.

Today a spectacular ruin, its position in Turkish territory and questions about access to ad conservation of the site has made Ani into another political issue in modern Armenia and Turkey's already fraught relationship:

http://www.economist.com/diversions/displaystory.cfm?story_id=7066270