This close-up view of the light room at the top of the Old Point Loma tower reveals the sturdy construction -- heavy glass, riveted steel, contoured roof -- that helped it withstand the winter storms. 2007 Joyce and Ainsley Dixon
The shoreline around Portland Head Light alternates between rugged rock formations and beaches of smooth, sorted cobblestone. Portland Head is one of the most frequently visited lighthouses in America.
Boar's Head Lighthouse, Nova Scotia. Lighthouses warning ships of hazards or help them into port. For 100s of years they have quietly supported global trade. How lighthouses work: http://adventure.howstuffworks.com/lighthouse.htm How a lighthouse beam is magnified: http://www.loc.gov/rr/scitech/mysteries/lighthouse.html Trinity House education resources http://trinityhouse.co.uk/news_info/education/education_resources.html also Safe At Sea (primary) http://trinityhouse.co.uk/safeatsea/