The views and sunset are amazing from the most western point of continental Europe (and Portugal). Although it is quite an attraction, busses come and go, there are some nice spots to be found to enjoy the scenery. The walkway on the other side of the lighthouse has some great views on the cliffs as well.
Go early if you want to have Cabo da Roca for yourself. The first bus arrives around 08:30 the last leaves around 22:00.
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