Ushijima Shrine

Ushijima Jinja (牛嶋神社), founded in 860, is a Shinto shrine situated in Sumida Park on the east bank of the Sumida River just across the river from Asakusa. (Sumida Park is located on both sides of the Sumida River.)
It's Reitaisai, or the Annual Grand Festival, is held in mid-September, but it will be fully conducted only once in five years.
It's a 7-min walk from Toei Oedo Line Honjo-Azumabashi Station, or a 6-min walk from Tobu Line Tokyo-Skytree Station.
If you go a little north, there is Mimeguri Shrine.

Kaguraden is where music is played during festivals.

Miwa Torii is a rare type of Torii which attaches two Torii on both sides of a Torii. Behind this Torii stands Haiden, the building in front of which people offer prayers.

Honden is where the divinities are enshrined. Heiden connects Honden with Haiden.

Japanese Garden in Sumida Park

There's a small Japanese garden in Sumida Park situated next to Ushijima Shrine (open 24 hours, admission free).