The 14th-century fortress of Fort la Latte

Fort la Latte, often called the Castle of the Rock Goyon (French: La Roche-Goyon, Breton: Roc'h-Goueon), lies about 4 kilometres (2.5 mi) southeast of Cap Fréhel and approximately 35 kilometres (22 mi) west of Saint-Malo, in the commune of Plévenon, Côtes-d'Armor. Classified as a monument historique, it was first built in the 14th century by Etienne III Gouÿon, the Lord of Matignon. Bertrand Du Guesclin besieged it in the 14th century, and it was assaulted and captured again during the Wars of Religion in the sixteenth century.

Abandoned after the wars, the castle was fortified in the 18th century under Louis XIV and remained in service until the fall of the First Empire. It was acquired by the historian Frédéric Joüon Des Longrais in 1931 and was classified as a monument historique by the French Ministry of Culture in 1925.

Now, visitors can tour the castle, which features a dungeon from 1365–1370, a water tank, a chapel, defensive structures, a governor's house, and a courtyard. A small menhir is found on the path to the fort, known in local legend as Gargantua's Finger.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons