Please note that this cache will be archived towards the end of October 2025.
The London Charterhouse is a historic complex of buildings in Smithfield, London, dating back to the 14th century. It occupies land to the north of Charterhouse Square.
The Charterhouse began as (and takes its name from) a Carthusian priory, founded in 1371 and dissolved in 1537. Substantial fragments remain from this monastic period, but the site was largely rebuilt after 1545 as a large courtyard house. It was further altered and extended after 1611, when it became an almshouse and school, endowed by Thomas Sutton. The almshouse (a home for gentlemen pensioners) still occupies the site today under the name The Charterhouse; the school moved out in 1872 to Godalming, Surrey.
Thanks to oBATCHo for letting me borrow his idea for this puzzle.