Cly castle - Credit: Wikimedia Commons
Cly is a castle in the Italian town of Saint-Denis, overlooking the Dora Baltea () river, in Aosta Valley, northwest Italy. It belongs to the so-called primitive style of castle, consisting of a keep with a surrounding wall. The ruins rise from a bed of metamorphic rock, on the edge of a fault line which extends to the Castle of Quart.Francesco Prinetti, Andar per sassi. Le rocce alpine fra natura e cultura. Valle d'Aosta, Canavese, Valsesia, Quart (AO), Musumeci, 2010, pp. 36-37, . Read more on Wikipedia
Source: en.wikipedia.org