Tenmangū (天満宮) is a Shinto shrine which enshrines Sugawara no Michizane as Tenjin.
There are about 14,000 such shrines in Japan; famous examples include: Dazaifu Tenman-gū and Kitano Tenmangū are often grouped together with another of these shrines and called the "Three Great Tenjin Shrines", but there is no generally accepted criterion for the selection of a third shrine.
[1] Media related to Tenman-gū at Wikimedia Commons