Angkor

Angkor: "The ancient city of Angkor , built in brick and sandstone by the Khmer empire, is spread over 40+ miles around the modern day city of Siem Reap near the Cambodian capital Phnom Penh. Built from around 800's-1200 ce it is now believed to have once held one million residents before it was deserted in the 15th century"'via Blog this'