After visiting Palacio Consistorial, the Roman Theatre and Concepción Castle, return to Plaza del Ayuntamiento. At the north end is the Ministry of Agriculture and Environment. This building is the start of Calle Mayor, a main retail district of Cartagena. Your window shopping options include department stores, fashion boutiques and jewelry stores. The street’s blue marble tiles are reserved for pedestrians. So take your time exploring the shops, restaurants, cafes and bars tucked inside elegant Modernista buildings. The narrow side streets are equally worth exploring.