Lantern Tower - Credit: Wikimedia Commons
The Lantern Tower () is one of the three medieval historic towers in La Rochelle, Poitou-Charentes, France, which guarded the port at Aunis. The Lantern tower served as a Lighthouse and a prison throughout its history. It was also known by other names: Garrot tower, Priest tower, and Four Sergeant tower. In 1789 the French government declared it a Monument historique Read more on Wikipedia
Source: en.wikipedia.org