The vast Fortaleza de San Carlos de la Cabaña, known as ‘La Cabaña’, running beside the harbor, was constructed after the English capture of Havana in 1763. The largest of the military structures built by Spain in the Americas, this fortress was completed in 1774 and its presence formed an effective complete deterrent against the country's enemies. The polygon, occupying an area of around 10 hectares, consists of bastions, ravelins, moats, covered walkways, barracks, squares and stores.  It is impressively well preserved, and the gardens and ramparts are romantically lit in the evening. This fortress hosts the spectacular nightly ceremony of El Cañonazo de las Nueve (cannon fire at 9), the firing of a cannon that marked the closing of the city gates, one of Havana's longest-held and most attractive traditions.

A few steps towards Calle Brasil from Plaza del Cristo Square is where the 1886 Museo de la Farmacia Habanera is located. Founded by the Catalonian José Sarrá, it is a shop-museum and nowadays still functions as a pharmacy. The museum displays the history of pharmacies in Havana and their evolution in Cuba. This Pharmacy preserves its original Neo-gothic furniture with Moorish influences, and host a large collection of medicine bottles and medical tools, extracted from archeological excavations in the old city, as well as a book collection with valuable prescriptions for the study of Cuban pharmacopoeia. The museum also exhibits an elegant scale model of an old pharmacy with captivating historical explanations.

The Santo Cristo del Buen Viaje Church is a simple yet charming church. It is located in Plaza del Cristo Square, on the western side of Old Havana, away from the city center and tourist areas. The structure of the church is intriguing because of the simplicity of its towers and of its lateral façades, in complete harmony with the character of the works of the 17th century. The church was built in 1732 in the same place where previously there was a Franciscan shrine. Nowadays it has only partially been restored, with its beautiful stained glass windows and brightly colored ceiling being very noteworthy qualities. Inside the church, the image of Jesus on the Cross among travelers and sailors became very popular because it was thought to keep people from harm. On Good Fridays the processions left from the Convento de San Francisco de Asís and ended at the Iglesia del Cristo. The dimensions of the plaza were planned according to the processions that were to take place in it, marking the end of the fourteen crosses or Stations of the Cross. The Plaza del Cristo Square is an ideal place if you want to get far from touristy areas and to witness what real Cuban life is like.

The Catedral Ortodoxa de Nuestra Señora de Kazán (Nuestra Señora de Kazán Orthodox Cathedral), declared World Heritage Site by UNESCO, is one of the newest constructions in Havana, being built in 2000. This Russian Orthodox church is Byzantine in style. It has six beautiful domes, two of which (the biggest and smallest) are gold-sheeted, and the rest are made of bronze. Its staircase entrance calls our attention and is considered the second largest staircase of all outside Russia. From the interior, its golden altar stands out, built in Trinidad and the San Sergio Monastery, Russia; and the murals adorning its walls.