The search for lost treasures of kings, pirates, and sunken empires continually fascinates people. More than the alluring wealth, it is the adventure and challenge of an unsolved mystery that attracts so many treasure hunters. In Europe, searches are underway for the silver treasure hidden by Bavarian Elector Maximilian I in 1648 and for the jewels of King John Lackland, the brother of Richard the Lionheart. One of the most mysterious treasures is located in Rennes le Chateau and was discovered over a hundred years ago by a Catholic priest; however, it has been lost again since his death. The author also focuses on the most important treasure islands across all the world's oceans, where pirates buried their loot, including the lost treasure of the "Sea Devil" Felix Graf Luckner, the famous German privateer from World War I.