Most notable are the `` Magasins Waucquez '' , formerly a department store , now the Brussels Comic Book Museum and four of his private houses ( `` hôtels '' ) , which were designated as a UNESCO World Heritage Site : List of works .
Most notable are the `` Magasins Waucquez '' , formerly a department store , now the Brussels Comic Book Museum and four of his private houses ( `` hôtels '' ) , which are UNESCO World Heritage Sites :