Question

In which country did the original stupa evolve into a pavilion-like watchtower?

Answer 1

Japan did the original stupa evolve into a pavilion-like watchtower.

Answer 2

The country is Japan.

A stupa is a structure that is built up to place the historical value that is with extreme religious values of Lord Buddha.

The stupa is mostly related to Buddhism and its related aspects.

You will gather a lot of information if you have a good understanding of the Stupa and its evolution.