Belgium is a wonderful country to visit with kids, thanks in part to the medieval castles like Gravensteen in Ghent. With towers and dungeons and an actual moat, kids will love this European castle.

The neoclassical castle, which was completed in 1904, sits on a plump 10-acre parcel. The site, however, dates back to the 15th century, when the property was a quarry that belonged to a former ...