Haut-Bugey in 4 days

A glacial lake 2.7 km long at the bottom of the Nantua gorge, up to 43 metres deep, between steep wooded slopes.

In Nantua's old prison, one of France's richest Second World War collections, on the maquis, the 1943 round-up and deportation.

The last trace of a Benedictine abbey linked to Cluny: a late 11th-century Romanesque church given early Gothic vaults a century later.

Ruins of one of the largest ice works in France, where lake ice was cut from 1864 and sent by train as far as Algiers.

A small lake in a clearing of firs and spruce above 800 metres, nicknamed the little Canada of the Haut-Bugey, protected since 1935.

Over 16,000 objects tracing how Oyonnax went from carving boxwood, horn and celluloid combs to the heart of Plastics Vallée.

Three corner pillars of a temple from the late 1st or 2nd century, in ancient Isarnodurum, where Roman roads from Geneva and Lyon met.

The Albarine drops more than 115 metres off the Hauteville plateau, one of the highest falls in France, at the head of the Albarine gorges.