The largest of the bastions was originally built to protect the Puerta de Mar, a sea gate that served as one of four original entrances to the city. Because it uses no supporting walls, it resembles a Roman triumphal arch. Baluarte de la Soledad has comparatively complete parapets and embrasures that offer views of the cathedral, municipal buildings, and old houses along Calle 8. The museum inside—Museo de Arquitectura Maya, dedicated to Mayan architecture—is
closed for renovations at this writing.