Also particularly striking are the buildings in the Art Nouveau style, most famously by the Belgian architects Victor Horta, Paul Hankar and Henry Van de Velde. Some of Brussels' municipalities, such as Schaerbeek, Etterbeek, Ixelles, and Saint-Gilles, were developed during the heyday of Art Nouveau and have many buildings in that style. The Major Town Houses of the Architect Victor Horta—Hôtel Tassel (1893), Hôtel Solvay (1894), Hôtel van Eetvelde (1895) and the Horta Museum (1901)—have been listed as a UNESCO World Heritage Site since 2000. Another example of Brussels' Art Nouveau is the Stoclet Palace (1911), by the Viennese architect Josef Hoffmann, designated a World Heritage Site by UNESCO in June 2009.