St. Nicholas Cathedral or Nicholai-do is located at one block distance from JR Ochanomizu station. Being a little bit isolated from other tourist attractions it is usually overlooked, as not many things are around this area. I would only recommend a visit if you have plenty of time. It means a visual change from typical shrines (architectural wise), but the mandatory payment for entering, being given a brochure and a candle (if you are orthodox) seems preposterous. An outside visit might be enough for most tourists. Not far from here you can complement the visit with a small walk on one of the musical instruments streets of Tokyo.
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