Hudson River, NY A testament to technological progress - the Saugerties’ Lighthouse’s solar-powered beacon (circa 1990) replaces a 225-candlepower Argand lamp and Fresnel lens (circa 1935) that had, in turn, replaced the mineral oil lamps (circa 1850) which replaced the original whale oil lamps (circa 1835). Thanks to the vision of a local historian, the Light House was restored to its current glory in 1990. Still some things are left to nature - guests of the lighthouse’s two-room inn check-in and out according to Hudson River tide.