Chandragupta Pillar Hall | Mauryan Palace Archaeological Site | Kumrahar Patna Site of the Mauryan Palace, also known as Kumrahar, was excavated by the Archaeological Survey of India since 1913 and is situated at least 6 km to the east of Patna Railway Station. An 80-pillared hall with the name Arogya Vihar was discovered at the site of Kumrahar (Mauryan Palace) in the ancient city of Pataliputra.