A captivating contrast of old and new, Luxembourg City's past is celebrated by its World Heritage status; its present sway by its position as headquarters for several significant European institutions. Small enough to explore on foot, this compact city offers a wealth of attractions, including dramatic promontory The Bock, underground passages in Petrusse Casemates, Palace of the Grand Dukes and the National Museum. Countless banks on Boulevard Royal, once a fortress moat, hint at the duchy's wealth.