Castle Campbell, located in Dollar, Clackmannanshire, Scotland, was the seat of the earls and dukes of Argyll from the 15th to the 19th century. It's like a medieval time capsule that Mary, Queen of Scots, even visited back in the day and thought, "Hey, this place reminds me of home." The castle has seen its fair share of history, from religious reformations to royal visits, and even a bit of drama with sieges and rebellions. Today, it's managed by Historic Scotland and stands as a scheduled ancient monument, giving visitors a peek into Scotland's past.