Kew Observatory
London Borough of Richmond upon Thames, United Kingdom
The King's Observatory (called for many years the Kew Observatory) is a Grade I listed building in Richmond, London. Now a private dwelling, it formerly housed an astronomical and terrestrial magnetic observatory founded by King George III. The original design by architect Sir William Chambers influenced the architecture of two Irish observatories: Armagh Observatory in Northern Ireland, and Dunsink Observatory near Dublin.
Observatory data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).