Hanazono Jinja Shrine

Hanazono Jinja (花園神社) is a Shinto shrine adjacent to Kabukicho, one of the most famous entertainment districts in Japan.
When it was founded is unknown but it already existed in 1590.
It is basically an Inari shrine, which is widely worshipped as a god of business prosperity.
The shrine complex was lost in WWII and present one, made with concrete, was reconstructed after the war.
If you look closely into the shrine, you can find the traces of phallus worship now almost extinct in Japan.
It's several minutes' walk from Shinjuku-Sanchome Station of Toei Shinjuku Line, Tokyo Metro Marunouchi Line & Fukutoshin Line. It's also several minutes from Shinjuku Station.

Shaden is the main building of the shrine.

Kaguraden is where dance and music is offered at festivals.

Geino Sengen Shrine is a small shrine in the precincts of Hanazono Shrine. This is a shrine which is dedicated to Mt Fuji and is situated on a mound imitating the mountain. The mound is composed of rocks brought from the foot of Mt Fuji.

Itoku Inari Shrine

Itoku Inari Shrine is another small shrine on the grounds of Hanazono Shrine. If you look closely, there are two phalluses at this shrine.

Reitaisai

The Reitaisai (the Annual Grand Festival) of Hanazono Shrine is held in late May. In even-numbered years, two mikoshi (portable shrines) owned by the shrine parade through the territory the shrine protects all day. In odd-numbered years, eight mikoshi owned by local communities conduct a joint procession. For details about this event, see the Reitaisai at Hanazono Shrine.

Tori-no-ichi Market

The Tori-no-ichi are held twice or thrice in November. This is a market which sell decorated rakes which are said to gather fortune, and are held in Tokyo at dozens of Shinto shrines. For details about this event, see the article about the Tori-no-ichi at Hanazono Shrine.