Cyclopean wall of Rajgir, dating back to 600 BC was built during the Haryanka dynasty.According to TW Rhys Davids, "The stone walls of Giribbaja (Rajgriha) are the oldest extant stone buildings in India." A similar Hadrians wall was built in 122 AD during the Roman empire to defend against north.

Cyclopean wall of Rajgir, dating back to 600 BC was built during the Haryanka dynasty.According to TW Rhys Davids, "The stone walls of Giribbaja (Rajgriha) are the oldest extant stone buildings in India." A similar Hadrians wall was built in 122 AD during the Roman empire to defend against north.