The Barcelona City is home to the Treasure Map NPC's. These NPC's are responsible for compiling full Level 1, 2, 3, 4 and 5 Land and Sea Treasure Maps. They are also able to Exchange Treasure Maps to Treasure Map Pieces and can turn Treasure Map Pieces into a Treasure Map Fragment which are needed in order to make the Treasure Maps.
Another important NPC related to Treasure Maps is Gonzales. He offers a series of quests that give rewards for compiling certain Treasure Maps. Click on his name to get a complete list of quests offered by him and their rewards. Among the rewards are a vast amount of Experience, a Free Level 140 Weapon of your choice, Reputation and a Spinach Meal among other things.