Paul and Sheryl sail into the historic harbour of Mahon, on the island of Menorca, said by the British Admiral Nelson to be the safest harbour in the Mediterranean. They moor at a unique floating platform anchored in the middle of the harbour where they are welcomed into a community of international cruising sailors. Menorca has the highest concentration of prehistoric ruins and monuments in the world and the Shards crawl through ancient natural tunnels in the cliffs to visit Neolithic cave-dwellings, Megalithic tombs and later explore sites where an unidentified culture has built huge standing stones and towers.