Photo: Rafesmar, CC BY-SA 4.0 Free historic sites in Córdoba
Photo: Rafesmar, CC BY-SA 4.0 
Photo: Toni Castillo Quero, CC BY-SA 2.0 Mezquita exterior and Patio de los Naranjos
Free, alwaysJudería
Free, always
Photo: Ajay Suresh from New York, NY, USA, CC BY 2.0 Calleja de las Flores
Free, alwaysPlaza de la Corredera
Free, always
Photo: Wolfgang Manousek from Dormagen, Germany, CC BY 2.0 Calahorra Tower exterior
Free outside, paid inside
Photo: michael clarke stuff, CC BY-SA 2.0 Plaza del Potro
Free, alwaysPlaza de las Tendillas
Free, always
Photo: kallerna, CC BY-SA 4.0