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During the Colonial Times, it was a silver producer; some people say it generated almost half the silver of the Spanish Empire. There are tons of old buildings like churches, some haciendas and manors; there is an Underground Street on which there used to be a river, it has tunnels and bridges. Also, it is nationally famous because there's a "mummies museum": they are not really "mummies", they are bodies which were preserved by the grounds of the local cemetery, it could support the idea of a Ghost-Type Gym.
On the south, the terrain could be like a desert full of Sandlash and other Ground-Type Pokémon; around the town there will be hills and mountains with Pineco, Misdreavus, Stantler, etc... Forest Pokémon and Ghost-Type Pokémon.