What to see · La Salle

The ruined castle a bishop of Aosta had built to bar the road coming down from the Little St Bernard.

Tradition says Innocent V was born here in 1224, though scholars do not confirm it.

Four floors, a spiral staircase in stone and wood, and a 250-year-old elder in the courtyard.

The Valdigne wetland, established in 1992, where the regional natural science museum does its research.

They call it a tower, but it is the church of Sant'Orso: the only historic building in Derby you can enter.