Gankutsuou: The Count of Monte Cristo (巌窟王, Gankutsuō?, literally The Ruler of the Cave) is an anime series loosely based on Alexandre Dumas, père's classic French novel, Le Comte de Monte-Cristo. Spanning 24 episodes, it was produced by Gonzo, directed by Mahiro Maeda and broadcast by Animax across its respective networks in Japan, East Asia, Southeast Asia, South Asia, Latin America, and other regions. Gankutsuou's unusual visual style layers Photoshop textures into digital animation, with backgrounds often rendered in 3D. The series features several famous pieces of classical music, including Tchaikovsky's Manfred Symphony, the Donizetti opera Lucia di Lammermoor, and Rachmaninoff's Piano Concerto No. 2

Source: Wikipedia