Calais Lighthouse (French: Phare de Calais) is located in Calais in Pas-de-Calais. The Lighthouse is located in the residential streets near the Port of Calais and is a significant landmark as well as a navigational aid to ships and ferries using the Straits of Dover. The lighthouse is 53m high, its tower is octagonal outside and round inside with walls 1.90m at the base and 1.50m at the summit. The foundations descend 7.40m under the cellars. The staircase has 271 steps leading up to the lantern. The central light of the lighthouse is permanent and the lantern, whose panels shut off the light, turns around the light, giving 4 flashes of 2/10th of a second every 15 seconds.