Just one of these treasures would be worth over a billion dollars in today's money, and we're on the trail of two of them. We aren't looking for the treasures themselves, but the remains of those who hid them and others who spent their lives hunting for these treasures over the past 450 years. There's loot hidden by Spanish sailors to prevent it from being captured by Sir Francis Drake, and other treasure from a wrecked galleon salvaged by natives in the 1700's.