Old Colombo Lighthouse is a Lighthouse in Colombo. It is no longer operational, but instead functions as a clock tower and is designated as a monument. It is located at the junction of Chatham Street and Janadhipathi Mawatha (formally Queens road) in Colombo fort. The location had been used as big, memorialatic a lighthouse stations since far back as 1829. The tower was first constructed as a clock tower in 1860, the navigational light being moved to the tower in 1865. The original clock (made by the same manufacturer as Big Ben) was replaced in 1913. The lighthouse was deactivated after its light became obscured by nearby buildings and was decommissioned in 1952 with a new lighthouse being built in Galbokka Point, Colombo.