Formerly known as the Belfries of Flanders and Wallonia and now called the Belfries of Belgium and France after 23 such buildings in the north of France were added to the 33 already on the List from Belgium, these make an easy site to visit, since you can go to almost any town in Belgium or northern France and see a belfry there that's probably on the List. Generally speaking, a belfry is a symbol of a city's freedom from some outside overlord (as opposed to a castle - symbol of the feudal lords - and a belltower - symbol of the church) and later came to signify a city's wealth and prosperity. The ones I have seen are the ones in Ghent (a huge building that used to function as a fortified watchtower, also the only one I have seen from the inside - there are lots of stairs and a lift to take you to the top to enjoy a great view over the city), Bruges (a symbol of the city known the world over, as evidenced by the Longfellow poem The Belfry of Bruges; by law, no building in the city may be higher than the belfry), Lier (attached to the Town Hall), Leuven (part of St. Peter's Church, but not well visible), the 2 in Antwerp (cathedral and town hall), the 2 in Mechelen (also cathedral - very impressive - and town hall - the belfry forms the middle part of the building and is quite low), and the one in Amiens in France (quite nice, but nothing outstanding).