Shibamata Taishakuten Daikyo-ji Temple
The official name of Shibamata Taishakuten is “Kyoeizan Daikyo-ji.” It is a temple of the Nichiren sect of Buddhism, and as it was built in 1629 it has quite the long history.
Visiting the temple itself is free, but there's a JPY 400 admission fee to see the wood carvings inside. Totally worth it—the carvings are incredibly detailed. The ticket also includes access to a garden inside the temple, which is also beautiful.