Next to Tsukishima is Tsukudajima, a tiny island that escaped the earthquake, war and high rise redevelopment. While not all of the houses have been preserved, the scale and and small alleys have been. Walking there today, you can see residents still fishing, visit a beautiful old shrine Sumiyoshi Jinja, buy tsukudani (fish boiled in miso sauce) from Edo-era stores, and attend annual obon and omatsuri festivals.
This August there will be a special omatsuri festival that happens only once every 50 years. See the government website for more information: http://tsukuda.chuo.tokyo.jp/
More photos after the jump.