The Vision of Escaflowne
Mecha have been used in fantasy settings, for example in the anime series "Aura Battler Dunbine", "The Vision of Escaflowne", "Panzer World Galient" and "Maze". In those cases, the mecha designs are usually based on some alternative or "lost" science-fiction technology from ancient times. In case of anime series "Zoids", the machines resemble dinosaurs and animals, and have been shown to evolve from native metallic organisms.