Exit through the small western door and emerge on Boulevard F D Roosevelt, one of a number of streets that commemorates the American liberators of 1944. Immediately to the right is the sober Renaissance-style Bibliothque Nationale which used to be the Jesuit seminary.
Turn left and left again up Rue de la Congregation to enter the pedestrian area that links a number of medieval refugios that were built for monasteries, some as far away as Trier in Germany. In the event of siege or attack the monks could decamp to the fortified city of Luxembourg with all their valuables. Nowadays these stately townhouses are government ministries. Number 4 Place de l'Europe retains its medieval tower and is now the Ministre d'Etat, the office of the prime minister, Jean-Claude Juncker.
Turning downhill past the Chamber of Deputies, you come to one of the most attractive areas of old Luxembourg and a good place to stop for a snack or cup of coffee. Flowerpots festoon the entrance to Ilt Gastronomique, a block of restaurants hollowed out of an old fortified house known as Am Tiirmschen. Inside you'll find Michelin-starred Le Bouquet Garni , Come Prima and Goethe Stuff. Duck under the passage that runs beneath this building and you're into a little yard with even more places to eat and "Mir wlle bleiwe wat mir sin'' ("We want to remain what we are''), painted in gothic script beneath one of the bay windows. This has long been the motto of independent Luxembourg.
As you enter Rue Sigefroi, note St Michael's Church on your right and the National Museum of Art (free Thursdays, closed Monday) immediately opposite. This glass and stone box is one of the few modern buildings in the historic centre. Level 3 contains paintings from the 13th to 20th centuries. There's a watercolour of the city by Turner here and a castle drawing by Victor Hugo.
By contrast, St Michael's Church, prettier inside than out, dates back to the 10th century when it was built as a chapel for the counts of Luxembourg. Follow Rue Sigefroi down to Monte de Clausen, a road that links the city to Count Sigefroi's castle on the narrow Bock promontory. Although the castle was demolished in the 19th century, you can still see its superb defensive position on top of 48m cliffs that drop down to the Alzette river. If you now look back at the city you can see remnants of the mighty walls that made Luxembourg so difficult to subdue. It's staggering to think that only 10 per cent of the fortifications remain. In the end it was to stop the French and Germans going to war over this valuable fortress city that the Treaty of London guaranteed Luxembourg's independence in 1867 at the price of dismantling most of its defences.
Before turning back into the city look across the Alzette Valley to where Kirchberg is rising up fast. Luxembourgers call Kirchberg "Our Manhattan''. For defensive reasons this plateau was not built on until 1963. The skyscrapers contrast dramatically with the historic city: the future of independent Luxembourg.
- INDEPENDENT