The ancient city, the ruins of which are called Palaeopoli ("old city"), was situated on the north coast. Considerable remains still exist of the ancient walls, which were built in massive Cyclopean style, as well as of the Sanctuary of the Great Gods, where mysterious rites took place which were open to both slaves and free people (similar to the Eleusinian Mysteries). The Book of Acts in the Christian Bible records that the Apostle Paul, on his second missionary journey outside of Palestine, sailed from Troas to Samothrace and spent one night there on his way to Macedonia.