16: Issham al Baher
This yacht, which once belonged to late Greek shipping tycoon Stavros Niarchos, was built under the name Atlantis I. Niarchos is thought to have later offered the yacht to King Fahd of Saudi Arabia or built the vessel as a replacement for a yacht he gave the Saudi Royals.
15: Atlantis II
Greek shipping tycoon Stavros Niarchos reputedly ordered Atlantis II to compete with Aristotle Onassis’ Christina O. The Hellenic shipyard in Skaramanga built the yacht in 1981. Twin 12-cylinder, 4800-hp Pielstick diesel engines power Atlantis II, which is equipped with a retractable swimming pool.