Wikipedia
Bojjannakonda
Bojjannakonda and Lingalakonda are two Buddhist sites which exist on adjacent hillocks near a village called Sankaram. It is located at about 45 km from Vishakhapatnam and just a few kilometers from Anakapalle. The sites are believed to date between 4th and 9th Century A.D, that was when at Sanakaram (Sangharam as it was called then) when the 3 phases of Buddhism ( Hinayana, Mahayana, and Vajrayana) flourished.