A captivating contrast of old and new, Luxembourg City's past is celebrated by its World Heritage status, while its present sway is clear from its role as headquarters for several major 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.