The splendid Grand Curtius uses the thoroughly renovated mansion of a 17th-century Liège entrepreneur to unite four discrete museum collections. It then makes a very ambitious stab at explaining the whole history of art from prehistoric stone chippings to art-nouveau pianos, while interweaving tales of Liège artists and industries. The result is somewhat bewildering, but there’s an incredible wealth of treasures to discover; you’ll need a couple of hours to do it justice, more with the detailed audio guide (included) and temporary exhibitions (extra).