Used as beacons to navigate ships through hazardous shoals and reefs, lighthouses have traditionally provided safe entries into harbours. Though widely used in the past, they have now been replaced by modern navigational instruments. However lighthouses across the world are symbols of the marine culture of those times when sailors relied on the blinking light emitted from these imposing structures to make way to dry land. Lighthouse architecture is a study in structural engineering, illumination and optical systems. Though these architectural marvels are no more in use, they have their place in history. Here is a curated collection of historical and charming lighthouses around the world.