The tower that was built to be seen from a distance

Château Moncade, a ruined castle in Orthez, Pyrénées-Atlantiques, France, stands atop a hill. The central tower, completed in 1273, was surrounded by high curtain walls and moats, offering views of the surrounding areas for more than 30 kilometers. Gaston Phébus, Count of Foix, made alterations to the castle in the 14th century. The castle was burned during the Wars of Religion in 1569, and later sold during the French Revolution. Today, only the keep remains, in a fair state of preservation. The castle is open to the public, showcasing a model of the site.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons