For the art lover, Prague should rank among the top of the world’s must-visit destinations. This city of about 1.3 million people punches far above its weight class when it comes to modern and contemporary art. Tourists in Prague crowd themselves into three places: the castle, Charles Bridge and Old Town Square. But I found no fewer than 10 museums and galleries rich with world-class art, all of which were deliciously quiet. They ranged from converted palaces to vast and airy industrial buildings.