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Tallest in the world
The biggest lighthouse ever built was the Pharos of Alexandria, which stood 124m tall. It was one of the Seven Wonders of the world. The world's tallest lighthouse today is in Yamashita Park, Yokohama, Japan, and is 106m tall.
Tallest in the UK
The Bishop Rock lighthouse off the Scilly Isles, built in 1858, is 49m tall and has a helipad on top. The equally tall Eddystone lighthouse, off Plymouth, was originally made of wood. The one there now is the fifth on the site, and was opened in 1882
Tallest in the US
The Cape Hatteras lighthouse in North Carolina was built in 1870. It is the tallest in the USA at 59.7m. The lighthouse was being eroded by the sea so between 1999 and 2000 the entire 2,540-tonne building was moved 884m inland, very slowly, on tracks.
I hope to visit one of the tallest light house in the world someday soon. :)