St Bees lighthouse is on the North Head and is still operational. The first lighthouse was built in 1718, but the present building dates from 1866. In 1987 the light was fully electrified, giving a beam which can be seen 18 nautical miles (33 km) away. It was also de-manned and automated at this time.. It flashes twice every 20 seconds.
Next to the lightouse are the remains of a WW2 radar station, part of which is now used as a farm building.