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Inside the fresnel lens of a lighthouse. (The tallest land-based lighthouse in the UK)
Cool!
Are their taller lighthouses that are not land-based? Are they floating?
Well... I've tried to find out just now. Most taller lighthouses are on small rocks in the sea. On some the lighthouse covers the entire rock. I have also discovered that there are potentially taller land-based lighthouses in the uk, this one just seems to be best at advertising it.