Belfry and town hall museum.  A belfry is a typically Flemish edifice and symbolizes the wealth and independence of a town.  Shortly after its foundation, Sluis already attained great prosperity and soon plans were made to build a stately hall with an adjoining belfry tower.  It's noteworthly that Sluis has the only belfry in the whole of the Netherlands; it shouldn't be a surprise that this graceful tower has become the symbol of the town.  Another remarkable curiosity: did you know that the most well-known inhabitant of Sluis lives in the tower?  He is called "Jantje van Sluis".  His story goes back to the 80 years war and has been immortalized by a statue that you can see in one of the windows of the tower.  It is possible to climb to the top of the belfry.  Inside the town hall you can find a museum and the VVV (Tourist Office).
 

Museum "De Brak".  The windmill "De Brak", also simply referred to as the mill of Sluis, owes its name to a breed of French foxhounds called "Braque".  It's a stone flour mill and only one remaining in the town.  The Brak was constructed in 1739 and remained operational until the seventies of the 20th century.  At the end of the Second World War, the town was heavily bombed, severely damaging the mill.  Fortunately it was rebuilt afterwards (in 1951).  Restoration works were performed in 1982 which make that it is still in working condition.  In the adjacent buildings (the former mechanical mill) there is a tea-room/restaurant and a gift shop.  A museum has been established in the mill itself (access via the gift shop).