Domyoji Tenmangu is a holy place where spiritual souls meet to pray. You can do the same, or respectfully observe others in worship.
This sacred place is in Fujiidera, a destination that has lots going for it! Aeon Mall Sakai Kitahanada, Osaka Prefectural Sayamaike Museum, and Nagai Botanical Garden are other good sightseeing choices nearby when you're done at Domyoji Tenmangu.