The Baluarte de Nuestra Señora de la Soledad, designed to protect the Puerta del Mar, contains the fascinating Museo de la Arquitectura Maya, the one must-see museum in Campeche. It provides an excellent overview of the sites around Campeche state and the key architectural styles associated with them. Five halls display stelae taken from various sites, accompanied by graphic representations of their carved inscriptions with brief commentaries in flawless English.