Went to Guanajuato today. You can only access the mountain city by the sewer tunnels. Very elaborate. Think of a metro system with cars instead of trains. My mom and I met a family that let us into their apartment to shoot from the balcony and the roof. I'll post the pix of the tunnels and the roof top later. The lady holding the terracota roof shingle with the photo of Frida on it was the lady of the house. I bought a large clay scorpion mask from her doorway store front.