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Photo: via Wikimedia Commons, CC BY 2.0
A beautifully-restored 1800s-vintage Russian Orthodox cathedral located near Ochanomizu Station on the Chuo Line. Use the Hijiribashi exit. The Hijiribashi bridge by the exit is one of the better looking bridges in Tokyo and looks moderately attractive when lit-up at night.
The Holy Resurrection Cathedral , also known as Nikorai-do , is the main cathedral of the Japanese Orthodox Church, located in Chiyoda, Tokyo, Japan.
© OpenStreetMap contributors
マーチエキュート神田万世橋
A historic train station that's been converted into a shopping mall. Besides interesting shops and cafes, there's also a library and history exhibits about the station, including a large diorama showing the area around the station as it was in 1912 when it opened.
神田明神 Kanda-myojin
This shrine has a history dating back to the 8th century and had been highly regarded under the Edo shogunate. The current red-pillared structure has been rebuilt after being completely destroyed in the 1923 Great Kanto Earthquake. The Kanda Matsuri festival, which takes place in mid-May every other year is one of the largest in Tokyo and is a sight to behold. Arrive before noon or the shrine gets packed with spectators.
東京国立近代美術館, Tōkyō Kokuritsu Kindai Bijutsukan
With a modest permanent collection on display and regularly changing exhibitions, MOMAT is a nice place to kill a couple of hours after you've seen the Imperial Palace across the road. Entry to the nearby Crafts Gallery is included in the price.
Kept in impeccable shape, the gardens of the Imperial Palace are particularly beautiful during the March and April plum and cherry blossom seasons. During the Edo period, this was the heart of the Shogun's castle, and you can see the tenshudai, the raised platform where the tenshukaku (main keep) was once located, and an open field that was once the site of the honmaru goten, the Shogun's main residential palace. Entrance is free through a number of gates; you will be given a plastic entrance card at the gate, which you are obliged to return upon leaving; most visitors use the Ōte-mon (大手門) gate near the Ōtemachi subway station (exit C10). Also an easy walking distance from Tokyo station.
北の丸公園, kita-no-maru kōen
Connected to the East Gardens on the north side is this park. Offering much of the same, it is a convenient way to get to Yasukuni Shrine. The park also houses the Nippon Budōkan (日本武道館), which regularly stages martial arts competitions and live concerts, as well as the Kagaku Gijyutsukan (科学技術館, Science museum).
千鳥ヶ淵
One of, if not the most prominent cherry blossom site in Tokyo, and attracts throngs of people in its March-to-April peak season. It is located just across the street from Yasukuni-shrine. Rowboats are also available for one to row along a limited portion of the moat at ¥500 for 30 minutes, ¥1000 for an hour and at a slightly more expensive rate during cherry blossom periods.