Chōwaden Reception Hall

The Tokyo Imperial Palace (皇居, Kōkyo, literally 'Imperial Residence') is the main residence of the Emperor of Japan. It is a large park-like area located in the Chiyoda district of the Chiyoda ward of Tokyo and contains several buildings including the Fukiage Palace (吹上御所, Fukiage gosho) where the Emperor has his living quarters, the main palace (宮殿, Kyūden) where various ceremonies and receptions take place, some residences of the Imperial Family, an archive, museums and administrative offices. It is built on the site of the old Edo Castle. The total area including the gardens is 1.15 square kilometres (0.44 sq mi). During the height of the 1980s Japanese property bubble, the palace grounds were valued by some to be more than the value of all of the real estate in the U.S. state of California.

Chiyoda (千代田, Chiyoda) is a district of Chiyoda, Tokyo, Japan. In Japanese it translates as a "field of a thousand generations" Chiyoda covers the grounds of the Imperial Palace, and nothing else. It does not have any subdivisions, and no chome or postal code designation. The address of the palace itself and of the Imperial Household Agency is Chiyoda 1-1, the address of the Hospital of the Imperial Household is Chiyoda 1-2, the Imperial Guard Headquarters is Chiyoda 1-3. Its small population consists of Imperial guards and dependents. The Imperial family itself is not included in the registered population.

The Imperial Household Agency (宮内庁, Kunai-chō) (IHA) is an agency of the government of Japan in charge of state matters concerning the Imperial Family, and also the keeping of the Privy Seal and State Seal of Japan. From around the 8th century AD, up until the Second World War, it was known as the Imperial Household Ministry (宮内省, Kunai-shō). The Agency is unique among conventional government agencies and ministries, in that it does not directly report to the Prime Minister at the cabinet level, nor is it affected by legislation that establishes it as an Independent Administrative Institution.

Sakurada Gate (桜田門, sakurada-mon) is a gate at Tokyo Imperial Palace, in Tokyo, Japan. It was the location of the Sakuradamon Incident in 1860. Opposite the gate of Sakurada Gate is the headquarters of the Tokyo Metropolitan Police Department, which shares "Sakurada Gate" as a metonym (akin to London's Scotland Yard).

The Matsu no Ōrōka (松之大廊下, Great Pine Corridor or Hallway) was part of Edo Castle. The name derives from the painted shōji (sliding doors) that were decorated with motifs of Japanese pine trees (matsu). It was the passage which led to the Shiroshoin (白書院) from the Ōhiroma of the Honnmaru Goten (本丸御殿). The corridor measured around 50 meters in length and 4 meters in width. The corridor was the second longest with tatami mats in the castle. On March 14, 1701, Asano Takumi no Kami Naganori attacked and injured Kira Kozuke no Suke Yoshihisa after an insult there, which later led to the bloody incident of the Forty-seven rōnin. The corridor does not exist anymore just like the rest of the Shōgun's palace shortly before or during the Meiji Restoration in the later half of the 19th century. A stone marker with an inscription stands today in its place. The Great Pine Corridor has entered legends in stories such as the Chūshingura and also features in movies, parodies and TV advertisements.

The Three Palace Sanctuaries (宮中三殿, Kyūchū sanden) are a group of structures in the precincts of the Tokyo Imperial Palace in Japan. They are used in imperial religious ceremonies, including weddings and enthronements. The three sanctuaries are: Kashiko-dokoro (賢所) – the central shrine, enshrining a replica of the mirror Yata no Kagami, representing the mythological ancestress of the Imperial Family, Amaterasu. (For the enthronements in Kyoto of Emperor Taishō in 1915 and of Emperor Shōwa in 1928, the mirror was transported by special rolling stock known as the Kashiko-dokoro Jōgyosha (賢所乗御車) from the name of this sanctuary.) The Yasakani no magatama or Sacred Jewel, one of the Imperial Regalia of Japan, is also said to be housed in the Kashiko-dokoro. Kōrei-den (皇霊殿) – the Ancestral Spirits Sanctuary, enshrining the departed spirits of the Imperial Family from one year after their death. Shin-den (神殿) – the Sanctuary of the Kami, enshrining the Amatsukami (天津神) from Takamagahara and the Kunitsukami (国津神) from Japanese mythology.

The Sakuradamon Incident (桜田門外の変, Sakuradamon-gai no Hen, or 桜田門の変 Sakuradamon no Hen) was the assassination of Ii Naosuke, Chief Minister (Tairō) of the Tokugawa Shogunate, on March 24, 1860 by rōnin samurai of the Mito Domain and Satsuma Domain, outside the Sakurada Gate of Edo Castle.

Kokyo Gaien National Garden (or Kōkyogaien) is a national park (garden and park) in Chiyoda, Tokyo. It is located south of Tokyo Imperial Palace.

Sakuradamon Station (桜田門駅, Sakuradamon-eki) is a subway station on the Tokyo Metro Yurakucho Line in Chiyoda, Tokyo, Japan, operated by the Tokyo subway operator Tokyo Metro. It is numbered Y-17.

Kōjimachi (麹町 or 麴町) is a district in Chiyoda, Tokyo.

The Tokyo Metropolitan Police Department (TMPD) (警視庁, Keishichō) serves as the prefectural police department of Tokyo Metropolis. Founded in 1874, it is headed by a Superintendent-General, who is appointed by the National Public Safety Commission, and approved by the Prime Minister. The Tokyo Metropolitan Police Department, with a staff of more than 40,000 police officers, and over 2,800 civilian personnel, manages 102 stations in the prefecture.The main building of the Tokyo Metropolitan Police Department is located in the Kasumigaseki, Chiyoda ward, Tokyo. Built in 1980, it is 18 stories tall, a large wedge-shaped building with a cylindrical tower. It is easily seen from the street and a well-known landmark. The HQ building is located in Sakurada Gate, so it is also metonymically called "Sakurada Gate".

The Fukiage Palace (Japanese: 吹上御所, Hepburn: Fukiage Gosho) is the main residence of the Emperor of Japan, located in the Fukiage Garden on the grounds of the Tokyo Imperial Palace.