Answer: Stupas
Stupas are Buddhist commemorative monuments where sacred relics associated with the Buddha were placed.
The monument is richly decorated, consisting of a circular base supporting a massive solid dome, encircled by a railing and four gateways.
Under the rule of Asoka in 273-232 BCE, the wealth and size of the Kingdom depended on the number of stupas. Ashoka spread Buddha’s teaching by building approximately 84,000 stupas.