Kyoto Sentō Imperial Palace
Kamigyō-ku, Japan · built 1630
In Japan, the Sentō Imperial Palace (Sentō gosho, litt. "Emeritus Imperial Palace") traditionally does not refer to a single location, but to any residence of retired emperors. Before Emperor Akihito abdicated in 2019, the last Emperor to retire did so in 1817 (Emperor Kōkaku), so the designation commonly refers to the Kyoto Sentō Imperial Palace.
Palace data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).