 The "Claustro de Santa Teresa" (Saint Theresa Cloister), which has been remodeled and has become a hotel operated by Charleston Hotels.It has its own square, protected by the San Francisco Bastion.A 20-minute walk from downtown is the Castillo de San Felipe de Barajas, located in el Pie de la Popa (another neighborhood), one of the greatest fortresses built by the Spaniards in their colonies.