The Cathedral of The Virgin Mary of the Immaculate Conception (also known in Spanish as La Catedral de la Virgen María de la Concepción Inmaculada de La Habana) is one of eleven Roman Catholic cathedrals on the island of Cuba. Located in the Plaza de la Catedral, the Havana Cathedral is found in the center of Old Havana. This thirty-four by thirty-five meter rectangle church serves as the seat of the Roman Catholic Archdiocese of San Cristobal de la Habana which overlooks 7,542 square kilometers of the island and 2,821,000 Catholics.
Constructed after the capture of Havana by British forces and named San Carlos de la Cabaña in honor of King Carlos III, this 700-meter long fortress is the largest in the Americas. It was designed by army engineer Silvestre Abarca and features the most advanced military defensive concepts of the 18th century. It cost so much that King Carlos III requested a spyglass to see it, claiming that such an expensive project–approximately 14 million gold pesos–could surely be seen from Madrid.