Based on the 1st opus The Lightning Thief, a fantasy-adventure movie was released in 2010, starring Logan Lerman as the main character. And this summer, a sequel is finally scheduled to be released on August 7, under the name of Sea Of Monsters.
It draws the story of the same hero Percy, who tries to retrieve the Golden Fleece with the help of his two friends Annabeth and Grover. They must travel to the Sea of Monsters so they can save their training ground Camp Half-Blood.
Apparently it's going to be a great success and the best way to learn about mythology, especially if it's similar to the 1st movie and to the book it was inspired by.