Field work at the archaeological site of Alto da Vigia (Praia das Maçãs, Colares), in Portugal. In the westernmost municipality of the the European continent, overlooking the vast Atlantic Ocean, archaeologists are unearthing the artefacts from an old Ribat (Moorish convent) and a Mirhab (prayer niche) oriented Mecca. But the main objective of the excavations is to find the remains of a unique Roman Sanctuary, dated from 2nd to 3rd century A.D., which was dedicated to the Ocean, Sun, and later also the Moon. This sanctuary marked the end of the Roman Empire and the beginning of Oceanus, the great river which encircled the entire world. Today, Praia das Maças (Apple Beach) is a sand beach but for thousands of years it was a sea inlet, ideal for invasions, including at least one Viking incursion. Location: Google Maps. More information: Wikipedia, National Geographic (in Portuguese). Credit: Alto da Vigia Portugal by Jose Luiz Moutinho is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.