Along the Maud Foster Drain in Boston, Lincolnshire, a seven-storey brick tower sits among houses and sheds, pretending to be ordinary. Then you look up. The white sails cut across the sky, the ogee cap gleams, and the balcony wraps the tower like a belt. This is Maud Foster Windmill – over 80 feet to…

Boston Guildhall sits on South Street, a short walk from the river and the Stump. From the pavement it looks like a neat slice of late-medieval Boston wrapped in some tidy later brickwork. Inside, it turns out to be a quiet overachiever: merchant HQ, religious powerhouse, courtroom, jail, museum, wedding venue, and a footnote in…