If it&rsquos the Middle Ages you want, head for the old town. Narrow streets, shadowed arcades, diamond-paned windows and secrets &mdash the old town still breathes the air of the past. An easy half-day walking tour starts in front of the Grand Duke&rsquos Palace, a stately home built in Renaissance style by the Spanish who used it as their town hall before they were chased out in 1684. Turn the corner and walk 200m down Rue de l&rsquoEau to Place Clairefontaine and you will see the elegant façade of the Foreign Ministry, a former hostel for monks in Austrian baroque style. Behind the palace, and to the right is the National Museum which is filled with Roman, medieval and renaissance objets and has four floors underground. The square in front is called Feschmaart (fish market). No smelly fish here, but a dense collection of medieval houses which bear such unfashionably patriotic inscriptions as &ldquoMir wëlle bleiwe wât mir sinn&rdquo (we want to remain who we are). Further down is the oldest church in town named after that most romantic of saints, Michael the dragon-slayer. Cross the street and enjoy the most breathtaking view of the canyon around which the city is built. Bang in front of you is Luxembourg&rsquos first city castle, built in 963 by a certain Count Siegfried. Only outer walls remain. Its name Lucilinburhuc, or small castle, became Luxembourg.