Kasteel Beauvoorde West Flanders

Around 8km south of Veurne, the late-16th-century Kasteel Beauvoorde is an intact, picture-perfect (though tiny by castle standards), four-storey moated mansion with fully furnished interiors. It's free to wander around the pretty grassy area around the moat, and the surrounding village is a nice spot for a walk. The castle and church, opposite, provide a popular photo location for newlyweds.