Scalloway Pool

The former living quarters of Earl Patrick Stewart, built in 1600 by slave labour but ruined after his downfall. The key is available from the Scalloway Museum (opposite) during normal opening hours, but closed for restoration as of Sep 2022. The place occasionally gets mobbed by cruise ship tourists, but is otherwise quiet, so you have the agreeable experience of holding the key to a castle and letting yourself in. It's impressive but just a roofless shell.