It's the inner gate of Sensoji Temple named Houzoumon. It's also known as Nioumon.
Asakusa Guide
Asakusa Guide
Asakusa Sensoji Houzoumon Gate Tokyo Asakusa Pictures
From Shizuko Mishima, About.com
Asakusa Sensoji Temple Houzoumon Gate
Photo (c) Shizuko MishimaSuggested Reading
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