Bhārhut 

Site in Madhya Pradesh, India, of one of the earliest stūpas built on a mound which dates back to the Mauryan period. It was constructed around 100 bce, which is before the first images of the Buddha are found, and is decorated with carvings of trees and yakṣa figures. Many of the carvings are preserved in the Calcutta Museum.

A Dictionary of Buddhism, Oxford University Press, 2003, 2004 (which is available in electronic version from answer.com)