The Resilient Lighthouse of the Baltic: Finngrundet's Century-Long Voyage

Built in 1903, the Finngrundet lighthouse served for over a century in the Baltic Sea, undergoing various modifications such as the replacement of its paraffin light with an AGA beacon and a change from a fog bell to a 'nautophone' fog signal. Electrification of its light occurred in 1940, followed by further modifications in 1957. Now, it resides as a museum ship attached to the Vasa Museum, offering a captivating glimpse into its rich history.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons