Explanation:

Sanchi, The Buddhist Monuments located at Sanchi in Madhya Pradesh are a World Heritage Site in India and they are the oldest stone structures in India. Originally commissioned by emperor Ashoka in 3rd century BCE, the Sanchi Stupa is located 46 kilometer north-east of Bhopal. Its core was a hemispherical brick structure built over the relics of Buddha and was crowned by the Chatra which symbolizes rank. The stupa was vandalized during 2nd century BCE and renovated during the Satavahana Period when the gateways and the balustrade were built and colored. Apart from the Sanchi stupa, several other structures exist here, such as monolithic pillars, temples, palaces and monasteries. It remained a major pilgrimage site for the Buddhists till about 12th century AD, after which the religion declined in popularity.