The lighthouse is a rather tall building, and
can be found nearby the Northern Tower Town by following the twisty dirt road. It appears that rarely the Škorpion can be found at the top though no zombies spawn, however, basic loot can be found at the foot of the lighthouse and as well as the small shack that is right next to it.
it is compairable to the size of Giant Zombies.
It's a great view on top of the Lighthouse. You can see the Northern Tower Town from here.