Torii, or entrance to a sacred place, is a typical feature of Japanese architecture. It has a simple structure, with two vertical supporting columns and a horizontal pole on the top, usually vermillion in color.
The Torii you will find in the Senso Ji Temple is white, and leads to another shrine, called Asakusa Jinja, dedicated to the three founders of the temple: the two fishermen brothers who found the statue of Guanyin, and the chief of the brothers’ village.