Stories of buried treasure and ancient shipwrecks have captivated for centuries, from pirate tales to Hollywood blockbusters. For one team of explorers, however, legend became reality when they uncovered a trove of artifacts from a 350-year-old sunken Spanish galleon -- including coins, gemstones and priceless jewels once belonging to seafaring knights.The Nuestra Señora de las Maravillas (or Our Lady of Wonders) sank in 1656 after it collided with another boat from its fleet and crashed into a coral reef off the Bahamas. The vessel was carrying a haul of treasure, some of which was reserved as royal tax for King...