Japan
A park in the centre of Tokyo, the former site of Edo Castle and next to the Imperial Palace. It includes a wonderful Japanese garden, is rarely crowded (almost deserted when I went on a glorious Saturday afternoon), and, best of all, admission is free. Note that it is closed on Mondays and national holidays.
1-1 Chiyoda, Chiyoda-ku Metro: Otemachi, Takebashi, or Nijubashi-mae. Within walking distance of JR Tokyo Station.
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