A new exhibition about the Second World War is testing visitors in Amsterdam by asking them questions like "Would you hide a Jew from the Nazis?" 'The Bunker' opened its doors to the public in the Dutch capital last week. The building, about eight by eight metres wide and five metres high, is covered with images of concrete walls and looks like a world war bunker. Visitors are faced with dilemmas such as 'Can you stay friends with a Jew?.'