Pilsum Lighthouse, Lower Saxony, Germany

The Pilsum Lighthouse (German: Pilsumer Leuchtturm) was built in 1891 in order to provide a beacon for the Emshörn channel on Germany's North Sea coast. It is located on a dyke near the village of Pilsum in the municipality of Krummhörn. It has guided ships through the narrow channel since 1915. In the First World War its light was extinguished in order that enemy ships could not navigate the route. After that it was no longer needed, because the channel was changed. The height of the structure is 11 metres; the height of the light about sea level is 15 metres. Today the tower is one of the best-known symbols of East Frisia.
Source: Wikipedia-28.06.2011

 A card from Willi, German Number One on Postcrossing via official way.