Calais Lighthouse is a significant landmark as well as a navigational aid to ships and ferries using the Straits of Dover. There was a beacon at the summit of the watchtower from 1818. King Louis-Philippe in his plans to improve French ports decided the construction of a first-class lighthouse in Calais. This lighthouse started operating in 1848 and was electrified in 1883. After escaping the destruction of the Second World War it was automated in 1987.
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.
References:The Broch of Clickimin is a large and well preserved, though somewhat restored broch near Lerwick. Originally built on an island in Clickimin Loch (now increased in size by silting and drainage), it was approached by a stone causeway. The water-level in the loch was reduced in 1874, leaving the broch high and dry. The broch is situated within a walled enclosure and, unusually for brochs, features a large 'blockhouse' between the opening in the enclosure and the broch itself. Another unusual feature is a stone slab featuring sculptured footprints, located in the causeway which approached the site. Situated across the loch is the Clickimin Leisure Centre.