What can be said about the toranas that surround the great stupa?

Toranas are the walls that surround the great stupa that can be seen in India. Stupa symbolizes the "sakyamuni" which means "death and attainment of nirvana."  These Toranas are free-standing arched or ornamental gateway for ceremonial purposes that can be seen in the Buddhist, Jain, and Hindu. These usually have two pillars which carry 2-3 transverse beams.