011-44/16-2276-5400, leeds-castle.com, admission (valid for a year) $25.25 (£15). Budget Travel gallery: See the world's most beautiful castles Eilean Donan, Dornie, Scottish Highlands.

Ireland is celebrated for its lush landscapes, vibrant cities, and iconic sites, but some of its landmarks are less famous than others. With this in mind, the team at SumUp decided to look into the ...