• El Castillo San Felipe del Morro "El Morro" : is a sixteenth-century citadel that lies on the northwestern-most point of the islet of San Juan, Puerto Rico. It is part of San Juan National Historic Site and was declared a World Heritage Site by the United Nations in 1983.  .
 • El Castillo de San Cristóbal  is a Spanish fort in San Juan, Puerto Rico. It was built by the Spaniards to protect against land based attacks on the city of San Juan. It is part of San Juan National Historic Site.
 • La Fortaleza (or The Fortress in English) is the current official residence of the Head of Government of Puerto Rico which is the Governor. It was built between 1533 and 1540 to defend the harbor of San Juan, Puerto Rico. The structure is also known as El Palacio de Santa Catalina (or Palace of Santa Catalina). It is the oldest executive mansion in the New World. La Fortaleza was declared as a World Heritage Site by UNESCO.
 • El Catedral de San Juan Bautista: which contains the tomb of the Spanish explorer Juan Ponce de León.
 • Castillo de San Jerónimo is a small fort located in the entrance to what is known today as Condado, Puerto Rico lagoon in San Juan, Puerto Rico. The fort defended San Juan from attacks by Sir Francis Drake in 1595, Sir George Clifford "Earl of Cumberland" in 1598 and Sir Ralph Abercromby.
 • El Teatro Tapia is likely the oldest free-standing drama stage building still in use in a US insular area and one of the oldest in Latin America. Facing east, across from Plaza de Colon (Columbus), on Fortaleza street, and built about 1872.
 • Iglesia de San Jose dates back to 1523.
 • Ayuntamiento or Alcaldia or City Hall.
 • The municipal cemetery of Santa María Madgalena de Pazzis, located just outside the city walls.