St Mary's Tower, Hornsey
London Borough of Haringey, United Kingdom
St Mary's Tower, Hornsey is the only piece of architecture remaining from St Mary's medieval parish church in Hornsey, now part of the environs of north London. The tower is the oldest building in Hornsey, though the exact date of building is not known. It remains a consecrated space.
Church data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).