As an autonomous and iconic object, the museum frequently derives its effectualness from the signature of a star architect. Today the emphasis is again on the museum’s task of mediating and explaining, which brings with it the question about how museums can best reach a wider and, above all, younger public. Therefore, the temples must open up. But how? The urban design gesture made by a building is a central step. Using the examples of buildings and strategies between Hongkong and Saarbrücken we show how museums can give something back to cities.