Lübeck's small Holstentor city gate really is quite stunning. It captivated Andy Warhol (his print of it is in the St Annen Museum) and it's a sight where people sit and stare. Its twin, pointy-roofed circular towers, tilting together across a stepped gable, have made it a true German icon, which has graced postcards, paintings, posters, marzipan souvenirs and even the old DM50 note, as you'll discover in the engaging City History Museum inside.