You may have read the children’s book “The Little Red Lighthouse and the Great Gray Bridge”. Well this is in fact Little Red Lighthouse with the Great Gray Bridge (George Washington Bridge) on its left.
The book begins by introducing the lighthouse and its job of warning the boats on the busy Hudson River of the rocks nearby. Every night a man climbs up to the top of the lighthouse and turns on its flashing light. When there is fog, the man additionally turns on the lighthouse’s fog bell. The lighthouse is pleased with and proud of its important job (Wikipedia)
You can see it from the Hudson River, or if you visit Fort Washington Park in New York.