It's Tokyo's oldest and most visited temple. It's located in the old part of town — Asakusa.
Sensoji was destroyed in WWII (along with the entire Asakusa area). In the courtyard of the temple is a tree that was hit by a bomb during the war. The tree sprouted new branches from its stump and has regrown. The tree and the reconstruction of the temple after the war were both symbols of the country's recovery.
Most days, Sensoji is visited by throngs of domestic and international tourists. Half of the school kids in Japan visit Sensoji on a school trip at some point in their school career.
Sensoji's Gate is impressive. Its imposing massive red lantern is one of the largest in Japan. Its feasome nio protect the shrine from harm.
Another unique feature of the gate is Buddha's massive sandals.
There's also a shine on the grounds of Senso-ji temple appropriately named Senso-ji shrine.
In the temple's gardens it's almost possible to find a peaceful spot of serenity (like that found at so many of the temples in Kyoto).
Senso-ji isn't just popular with tourists. The temple is deeply entrenched in local life. There are long lines at the temple at New Years (visiting a temple is a New Year's tradition in Japan).
Senso-ji is also home to Tokyo's biggest and wildest festival: the Sanja Matsuri (attracts 2 million party goers).
Area MapSenso-ji is a 10 minute walk from Asakusa station.
If you visit Senso-ji be sure to check out Nakamise street in front of the temple. It's the best place in Tokyo to buy souvenirs.