Donjon des Seigneurs de Faverges
The Donjon des Seigneurs de Faverges (Keep of the Lords of Faverges) is a tower built in the 13th century and located inside the castle of Faverges. It is open to individuals during summer and offers a great view on the surrounding area.
I went there coming down the Pointe de la Sambuy, on the way back to Annecy.