This Stupa of Sanchi was originally constructed sometime in the 2nd century BC. In 1st century AD it was repaired and enlarged.
It is smaller than Stupa 1 and has only one gateway. It contained caskets of two disciples of the Buddha during his lifetime.
The 1st century AD torana (gateway) is exquisitely carved. On the front: the top architrave has floral designs, the middle architrave has a Stupa and two Bodi trees and the lower architrave represents paradise of Indra.
On the pillars the left side has a design of stupa and on the right is the Wheel of Dharma. Pot-bellied dwarves support the architraves.