Boath Doocot (National Trust for Scotland)

You'll find this 17th-century doocot standing alone in the fields just outside Nairn, a squat stone tower that looks rather like someone forgot to finish building a castle. It's one of Scotland's most unusual structures - a dovecot, essentially - where pigeons were kept to provide fresh meat and fertiliser for the estate. The circular building with its distinctive conical roof is genuinely striking, even if you're only passing through.

The real appeal here is the oddness of it. Most people rushing between the Moray coast and the Highlands won't have heard of doocots, let alone visited one. It's the sort of place that takes fifteen minutes to explore properly, gives you a feel for 17th-century rural life, and then you're on your way. History buffs will find it properly interesting - the stone work and design reveal quite a lot about what mattered to landowners back then. Kids might find it a bit underwhelming unless they're already keen on old buildings; there's not much to actually do beyond look at it.

It's free to visit and accessible year-round, managed by the National Trust for Scotland. Timing doesn't matter much since there's no gate or formal opening hours. If you're staying at Barrow Campsite Nairn, it's just over four miles away and makes for a decent fifteen-minute detour while exploring the wider Highland landscape. Worth stopping for if you're in the area, but don't plan a trip around it alone.