The little valley of Saint Andrew.
Officially it is the Val Saint-André; in Luxembourgish it is the 'Andreasgrënnchen'. The 1999 city map of the tourist office also lists it as 'an der Hiel', at the cave. The street links the rue de Rollingergrund with the rue Alexandre Fleming and is named after Saint Andrew. We have not yet found out why the saint gave his name to this valley.