Lighthouses

Lighthouses mark dangerous coastlines, hazardous shoals, reefs, and safe entries to harbors, and can assist in aerial navigation. Once widely used, the number of operational lighthouses has declined due to the expense of maintenance and use of electronic navigational systems.
Appart from that, there are something enimagtic on them, and many of them all over the world are very architectural. I collected some images with some of the most popular and beautiful ones from around the world...