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Imperial Palace
The residence of the Emperor of Japan, located in central Tokyo on the former site of Edo Castle. The grounds include the palace buildings, gardens, and a wide moat. Also used generically to refer to any emperor's palace.
Location
The 皇居 sits on approximately 115 hectares in the heart of Tokyo, surrounded by moats and stone walls from the original Edo Castle. The 皇居 周回コース (Imperial Palace loop, approximately 5 km) is one of Tokyo's most popular jogging routes.
Access
The main palace grounds are generally closed to the public, but the 東御苑 (East Gardens) are open for free visits. The inner grounds open to the public twice a year: on the Emperor's birthday and January 2nd (一般参賀).