Oldest temple in Tokyo and one of the biggest in this Town, Sensō-ji attracts tourist from all around the world. Usually is quite crowded, but if you have the chance to visit it after dark you might find a much more interesting atmosphere.
Asakusa was once the busiest place in Tokyo. The once famous Asakusa rokku was full theaters, cinemas, and all kind of shows. All that came to an end after WWII. The bombing and the fires destroyed mostly everything. Asakusa was rebuilt but all the lights and theaters are gone. Still if you go there and walk a little you still cant catch a glimpse of what once was.