Every Wednesday from 1400 to 1600, you can have a tour of the lighthouse for free. The lighthouse keeper speaks good English, and is very friendly. You have to climb a total of 100 steps, the last few being very narrow. At the top you can see the light (1000watt) and 1 tonne prism that sits on mercury. It can be turned with fingers of one hand, it is so well designed. The beam reaches out 29 nautical miles (around 34 statute miles) and flashes twice every 14 seconds.
You have to back down the last few steps to descend, and please don't touch the prism itself as the sweat from your hands will mark the glass.
A €5 tip was much appreciated!
No booking required, just turn up at the gate from 2pm.