All of the town is a historical site ; the architecture that has survived through the years gives Santa Fe de Antioquia the aspect of a city `` suspended '' in the colonial era , which is the reason the city was declared a National monument . All of the town is a historical site ; the architecture that has survived through the years gives Santa Fe de Antioquia the aspect of a city `` suspended '' in the colonial era , which is the reason the city was declared National monument .