Grótta is a spit of land in Seltjarnarnes, a neighboring town of Reykjavík, which turns into an island at high tide. During low tide one can reach Grótta on foot and stay there for approximately six hours before the isthmus is flooded. The first lighthouse in Grótta was built in 1897 and the current one dates back to 1947. The original lens is still in use and the lighthouse was electrified in 1956.
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