San Juan is the capital city and most populous municipality in the Commonwealth of Puerto Rico, an unincorporated territory of the United States. As of the 2020 census, it is the 57th-largest city under the jurisdiction of the United States, with a population of 342,259. San Juan was founded by Spanish colonists in 1521, who called it Ciudad de Puerto Rico.
Old San Juan is a historic district located at the "northwest triangle" of the islet of San Juan in San Juan. Its area roughly correlates to the Ballajá, Catedral, Marina, Mercado, San Cristóbal, and San Francisco sub-barrios (sub-districts) of barrio San Juan Antiguo in the municipality of San Juan, Puerto Rico. Old San Juan is the oldest settlement within Puerto Rico and the historic colonial district of the city of San Juan. This historic district is a National Historic Landmark District and is listed on the United States National Register of Historic Places as the Old San Juan Historic District. Several historical buildings and structures, particularly La Fortaleza, the city walls, and El Morro and San Cristóbal castles, have been inscribed in the UNESCO World Heritage Site list since 1983. Historically the mixed use commercial and residential real estate in the main streets like Cristo Street, Fortaleza Street (north) from Tanca Street to the Governor’s Mansion is the most valuable in the area and it has kept its value and increased steadily through several years despite the past economic turmoils.
San Juan National Historic Site in the Old San Juan section of San Juan, Puerto Rico, is a National Park Service-managed historic site which preserves and interprets the Spanish colonial-era fortification system of the city of San Juan, and features structures such as the San Felipe del Morro and San Cristóbal fortresses. This fortification system is the oldest European construction under United States jurisdiction and one of the oldest in the New World. This national historic site, together with La Fortaleza, have been designated a UNESCO World Heritage Site since 1983.
Río Piedras, Puerto Rico is a populous district of San Juan, and former town and municipality of Puerto Rico, which was merged with the municipality of San Juan in 1951. The district today is composed of various barrios such as Pueblo and Universidad. The historic town was founded in 1714 as El Roble, it was given municipality rights in 1823, and since 1903 it has been the home of the University of Puerto Rico's main campus, earning the popular name of Ciudad Universitaria today. The downtown and historic center of Río Piedras is officially known as the Pueblo barrio of the municipality of San Juan.
The U.S. Customs House, located at Bonaire and Aduana streets in barrio La Playa, Ponce, Puerto Rico, is the oldest customs house in Puerto Rico, and the only one of its type under the U.S. flag. As of 10 February 1988, the building was owned by the U.S. Customs Service, Washington, D.C. The building is listed on the U.S. National Register of Historic Places as "U.S. Custom House". It was listed on 10 February 1988.
The U.S. Customs House or "Edificio Aduana" is a historic custom house building located at Mayagüez, Puerto Rico. As of February 10, 1988, the building was owned by the U.S. Customs Service, Washington, D.C.
The Antiguo Cuartel Militar Español de Ponce or "El Castillo" is the only structure directly related to the events of the land defense of Puerto Rico during the 1898 American invasion of the Island. The historic building dates from 1894 and is located on Calle Castillo in Ponce, Puerto Rico, in the city's historic district. The structure was listed on the U.S. National Register of Historic Places on 14 May 1987.
The U.S. Customs House,, located at Calle Union, Fajardo, Puerto Rico, was constructed in 1930. The poured-concrete building is significant architecturally and historically for the role it played in the first, transitional phase of the American customs service in Puerto Rico, from 1898 through 1931. This period is bracketed on one end by the cession, on December 10, 1898, of the island of Puerto Rico to the United States by Spain as a condition of the Treaty of Paris ending the Spanish–American War, and on the other by the completion in 1931 of the major building and rehabilitation program undertaken by the U.S. Customs Service following World War I.
Adjuntas barrio-pueblo is a barrio and the administrative center (seat) of Adjuntas, a municipality of Puerto Rico. Its population in 2010 was 4,406.
The Old Piedras River Aqueduct, also known as the San Juan Waterworks, is an aqueduct in the barrio (district) of El Cinco of San Juan, Puerto Rico. It is by the Piedras River, next to the University of Puerto Rico Botanical Garden. This aqueduct dates to the mid 19th century and it was important for the urban development of Río Piedras.
The Advanced Defense Line is a historic district consisting of four structures that formed part of the eastern defensive system of the Islet of San Juan in San Juan, Puerto Rico.
The City Wall of San Juan is a city wall that surrounds the western end of the Islet of San Juan, site of the historic Old San Juan district in San Juan, Puerto Rico. This defensive wall system was built between the 16th and 20th centuries to protect the city and the Bay of San Juan, a highly strategic point in the Caribbean. These walls, along with the defensive fortresses in Old San Juan, form part of the UNESCO World Heritage Site-designated San Juan National Historic Site as they are characteristic examples of the historic methods of construction used in military architecture which adapted European designs and techniques to the special conditions of the Caribbean port cities.
The Gay Pride Community Building, also known as Casa Orgullo, is a historic site and former LGBT community center located in Río Piedras Pueblo in San Juan, Puerto Rico.
The Old Customs House of Humacao is a historic building located in Punta Santiago, in the municipality of Humacao, Puerto Rico. The structure was designed in the Spanish Colonial style, architecturally and typologically and finished in 1872 by the Department of Public Works of the Spanish Government in Puerto Rico. Until this time, the customs house was a temporary wooden building, so the need for a permanent structure made it possible that, in 1865, it was decided to construct the present building to serve as the new customs house at Punta Santiago.
The Superintendent of Lighthouses' Dwelling is an early 20th-century hacienda-style building located in the San Juan Coast Guard Station of La Puntilla in the Marina subdistrict (subbarrio) of Old San Juan. Although the exact date of construction is not known, deteriorated plan drawings of the old United States Naval Base that previously occupied the site of the coast guard station show that the building might have been built either in 1903 or 1908 as part of the regional lighthouses' depot. The building and its surroundings were identified as the Lighthouse Reservation at La Puntilla, with one of its earliest occupants, U.S. Lighthouse Superintendent J. P. Dillon signing and approving plan drawings by the Corps of Engineers. Although the architectural style is inspired in Spanish Revival haciendas found in both private and public buildings the United States, the specific "hacienda-style", as described by the U.S. government survey, was not indigenous nor common in Puerto Rico at the time, and the building and surrounding landscape represents the first design of its kind in the island after 1898.
The Church of Saint Michael the Archangel of Utuado is a historic Roman Catholic parish church located in Utuado Pueblo, the administrative and historic center of the municipality of Utuado, Puerto Rico. The church is listed in both the Inventory of the Historic Churches of Puerto Rico and the United States National Register of Historic Places due to its architectural and historical significance.
The Miami Building, also known as the Miami Apartments or the 868 Ashford Building, is a historic Art Deco building located in the Ashford Avenue of the Condado section of Santurce in the city of San Juan, Puerto Rico. The building was added to the National Register of Historic Places in 1984.
The Antonio Mattei Lluberas Residence, also known as La Casona Césari and the House of the Twelve Doors, is a historic late 19th-century manor house located in Yauco Pueblo, the administrative and historic center of the municipality of Yauco, Puerto Rico. The house was designed by architect Antonio Mattei Lluberas and built in 1893 by Angelo Cesari Poggi of the Césari Antongiorgi family, a Corsican-Puerto Rican family who was important in the development of the sugarcane industry of Yauco and southwestern Puerto Rico.
The Church, School, Convent and Parish House of San Agustín is a National Register of Historic Places (NRHP)-listed historic religious complex located in the Puerta de Tierra historic district of San Juan Antiguo in the city of San Juan, Puerto Rico. The complex consists of the Church of St. Augustine, its adjacent Augustinian convent and the parish house. The church itself was one of the first structures to be built using only concrete in the island and for this reason it is also listed in the Inventory of Historic Churches of Puerto Rico in 1990 in addition to being listed in the NRHP since 1985. The church complex is a contributing property, and, along the Capitol of Puerto Rico, it forms part of the monumental sequence of buildings, memorials and parks along the Ponce de León Avenue that constitute the Puerta de Tierra Historic District.
The Machín–Ramos Residence is a historic late 19th-century house located in San Lorenzo Pueblo, the administrative and historic center of the municipality of San Lorenzo, Puerto Rico. The building is the best example of 19th-century Spanish Creole vernacular architecture in San Lorenzo and a good example of this style of architecture in Puerto Rico, with well-preserved examples of this type of building becoming rarer throughout the island in the 20th century.
