Formerly atop an 88-step circular stairway leading to the deck observatory stood this glass prism behemoth called a Fresnel lens. The lighthouse was built in 1847 and first lit up the Key West shoreline in 1849. It was eventually outdated and automated working continuously from 1915. 1938.
You can find the former Key West beacon at the corner of Whitehead Street & Truman Avenue across from Ernest Hemingway’s House. There is an entrance fee to get into this portion of the Key West Lighthouse exhibit.