Explore details about location Place Léopold Wiener - Léopold Wienerplein. Place Léopold Wiener - Léopold Wienerplein is a location situated within the Watermael-Boitsfort - Watermaal-Bosvoorde alongside other areas such as Sentier des Merles - Merelspad, Rue de la Foresterie - Vorsterielstraat; Chaussée de La Hulpe - Terhulpsesteenweg, Sentier des Merles - Merelspad.