The Kyoto Imperial Palace was the royal residence of Japan's imperial family from the 15th century through the 19th century. Following the end of World War II, the palace grounds became a popular tourist attraction.
In 2277, the Imperial Palace was the site of the assassination of Hoshi Sato III by the Grand Admiral of the Imperial Starfleet Spock using the Tantalus field. Spock was immediately proclaimed Emperor. (TOS - Mirror Universe novel: The Sorrows of Empire)
After the conquest of the Terran Republic, the short-lived successor state of the Terran Empire, by the Klingon-Cardassian Alliance in 2295, the Klingon Consulate was built on the former site of the Imperial Palace. (ST - Mirror Universe novel: Rise Like Lions)