Denzuin (伝通院) is a Jodo Buddhist temple established in 1415 at a slightly different place from the present position. When the mother of Tokugawa Ieyasu, founder of the Tokugawa Shogunate, was buried here in 1602, the temple was relocated here to look after her grave and thus became a prominent temple. Throughout the Edo period, a number of Shoguns' wives and children were buried here. Owing to a massive fire in the Meiji era and bombardments in WWII, no buildings erected before the war remain, but the stone tombs of the family members of Tokugawa Shoguns are still left.
It's a 9-min walk from Korakuen Station or Kasuga Station. Korakuen Station is a station of the Tokyo Metro Marunouchi Line and Namboku Line, while Kasuga Station is one of the Toei Mita Line or Oedo Line.
Sanmon is the main gate.
Hondo is the main hall. It is dedicated to Amida Nyorai.
There's a small garden in front of the guest house.
Below two small temples are situated near Denzuin Temple. Each of them is a Jodo Buddhist temple which used to be a branch temple of Denzuin. If you are going to visit Denzuin, you might take a look at these, too.
Takuzosu Inari (沢蔵司稲荷), whose formal name is Jigen'in (慈限院), is a Buddhist temple resembling a Shinto shrine. It is located to the east of Denzuin. According to legend, a bright monk called Takuzosu who had been studying Buddhism at Denzuin for a few years from 1618 turned out to be the spirit of Inari living on the grounds of the Edo castle, and he told the then head monk of Denzuin to enshrine him through a dream, which resulted in this Inari shrine erected in the precincts of Jigen'in Temple in 1620.
Shinjuin is located to the west of Denzuin. When you face this temple from its entrance, there stands a Hondo (Main Hall) built in a modern design in front of you, but there's a small but neat Japanese garden behind it. There's a passage leading to this backyard in the northern corner of the Hondo. There are also several tombs of domain lords left.