Ikku Shrine is a holy site where religious souls come together to pray. Take a few reflective moments yourself, or respectfully observe others in worship.
You're spoiled for sightseeing choice when staying in Niihama. Ikku Shrine is a great place to kick off here, but there are plenty of other worthy attractions to enjoy. Minetopia Besshi, Bessi Dozan Memorial Museum, and Asahi Brewery Shikoku are near the sacred place and will top off your day nicely.