The stupa underwent major evolutions in the area of Gandhara. Since Buddhism spread to Central Asia, China and ultimately Korea and Japan through Gandhara, the stylistic evolution of the Gandharan stupa was very influential in the later development of the stupa (and related artistic or architectural forms) in these areas. The Gandhara stupa followed several steps, generally moving towards more and more elevation and addition of decorative element, leading eventually to the development of the pagoda tower. The main stupa type are, in chronological order: