Near the ancient Clairvaux Abbey, a small valley runs through the grand forest. Today the valley is named after Saint Bernard, but used to be called the Valley of Absinthe.
You can reach the listed site (since 1928) of Saint Bernard's Fountain after a two kilometre walk. It is the ideal place to stop and rest: the clear waters of the fountain bearing the coat of arms of Clairvaux Abbey run through a pool and then through a channel to join Saint Bernard's stream. A number of very old spruce trees provide cool shade.
Legend has it that it was here that Bernard de Clairvaux, founded his monastery in 1114, before moving it to its current site.
The site can be reached along a number of marked out footpaths. The most famous of these is the GR 703: the "Joan of Arc historical trail".