Explanation:

Chaukhandi Stupa, an ancient Buddhist site located in Sarnath, Uttar Pradesh , has been declared as a Monument and protected area of national importance by Archaeological Survey of India (ASI).The Chaukhandi Stupa is thought originally to have been built as a terraced temple during the Gupta period between the 4th and 6th centuries to mark the site where Lord Buddha and his first disciples met traveling from Bodh Gaya to Sarnath. Later Govardhan, the son of a Raja, modified the stupa to its present shape by building the octagonal tower to commemorate the visit of Humayun, the powerful Mughal ruler.