Inside the Lantern, the Fastnet Lighthouse, Co. CorkThe first time I visited the Fastnet, I spent most of my time just looking. You do that on the rock. The granite, the sea hammering below, everything about the place demands it. But the moment I remember most clearly happened inside the lantern room itself. There's a small hatch at the base of the lantern assembly. You climb up through it and look directly into the Fresnel lens from below. The geometry is extraordinary. Concentric glass prism rings,