As Rose and I wandered around the Cathédrale Notre-Dame-Immaculée in Monaco, I noticed a line queueing up in the front of the church. Without knowing what the line was for, we joined it. Visitors solemnly shuffled forward until they reached the star attraction: the tombs of Princess Grace Kelly and Prince Ranier, the American movie star-turned-princess and her long-reigning husband. Even if you know little about Grace Kelly, she’ll capture your heart in Monaco.