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Ximenez-Fatio House Museum is one of the best-preserved and most authentic Second Spanish Period (1783-1821) residential buildings in St. Augustine, Florida. In 1973, it was added to the National Register of Historic Places. It was designated a Florida Heritage Landmark in 2012. The museum complex sits just south of the city's central Plaza de la Constitución at 20 Aviles Street (formerly Hospital Street), the oldest archaeologically documented street in the United States. It is located at the center of Old Town, the city's oldest continuously occupied community. Since 1939, the property has been privately owned and managed by The National Society of The Colonial Dames of America in The State of Florida (NSCDA-FL). Through their efforts, it was restored and interpreted to reflect its function as a fashionable boarding house during Florida's first tourist boom, which began after 1821. The property is a historic house museum, furnished and presented to tell stories of the visitors who lodged there, the women who owned and managed it, and how people lived during Florida's territorial period.

Stanbury Cottage is a historic building at 232 St. George Street in St. Augustine, Florida. It is part of the St. Augustine Town Plan Historic District. On October 8, 2008, it was added to the U.S. National Register of Historic Places. Stanbury Cottage is one of the oldest examples of Carpenter Gothic architecture in Florida. The house has historic connections to Henry Flagler, Andrew Anderson, and Martin J. Heade who were often guests of the Stanburys.

The St. Augustine Free Public Library is the oldest non operating library in Florida; opened in 1874 as a "subscription library." The library was first located in the U.S. Customs house, now known as the Government House at 48 King St, St. Augustine, FL. Its second location, at 12 Aviles Street in St. Augustine, Florida, is the building currently known as the Segui-Kirby Smith House and still stands as a Research Library for the Saint Augustine Historical Society.

The Record Building is a historic U.S. site in St. Augustine, Florida. It is located at 154 Cordova Street. On April 26, 2006, it was added to the U.S. National Register of Historic Places.

For the Oldest House Museum in Key West, Florida see Old Island Restoration Foundation The Oldest House Museum is located in St. Augustine, Florida in St. Johns County, Florida. It is operated by the St. Augustine Historical Society and includes the González-Alvarez House, the Manucy Museum (named for Albert Manucy) of local history and the Edwards Gallery. The Oldest House, from which the museum derives its name, is located on a site that has been occupied since the 1600s. Formally known as the González-Alvarez House, it is the oldest surviving Spanish Colonial dwelling in Florida. The building dates back to the early 1700s. The house has been open to visitors since 1893. The United States Department of the Interior designated the house a National Historic Landmark in 1970.

The González–Álvarez House, also known as The Oldest House, is a historic house museum at 14 St. Francis Street in St. Augustine, Florida. With a construction history dating to about 1723, it is believed to be the oldest surviving house in St. Augustine. It is also an important example of St. Augustine's Spanish colonial architectural style, with later modifications by English owners. It was designated a U.S. National Historic Landmark in 1970. The house is now owned by the St. Augustine Historical Society and is open for public tours as part of the Oldest House Museum Complex. Evidence can be seen of the Spanish, British, and American occupations of St. Augustine.

The Historic Public Market, historically known as the Old Slave Market, Old Spanish Market or Public Market is a historic open-air market building in St. Augustine, Florida in the United States. In the late 19th and early 20th centuries it was frequently photographed and marketed as a kind of "heritage tourism" landmark. In 1964 it was the site of a Third Klan-led white-mob attack on a march in support of the Civil Rights bill.

The Lindsley House (also known as the Horruytiner House) is a historic home in St. Augustine, Florida. It is located at 214 St. George Street. On September 10, 1971, it was added to the U.S. National Register of Historic Places.

The Llambias House (also known as the Fernandez-Llambias House) is a historic house located at 31 Saint Francis Street in St. Augustine, Florida. Built sometime before 1763, it is one of the few houses in Florida to survive from the first period of Spanish Florida. It was designated a National Historic Landmark on April 15, 1970. The house is now managed by the St. Augustine Historical Society as an event venue.

Trinity Parish is an historic Episcopal Church at the corner of King and Saint George streets in downtown St. Augustine, Florida. It is the oldest Protestant church in Florida and has some of the oldest and most beautiful stained glass windows in the Episcopal Diocese of Florida.

Government House (Spanish: Casa del gobierno), also known as Governor's House, is located at 48 King Street in St. Augustine, Florida, adjacent to the Plaza de la Constitución. The building, constructed of coquina, served as the governor's official residence from c. 1710 during the First Spanish Period (1565–1763), throughout the British Period (1763–1784), and until 1812 in the Second Spanish Period (1784–1821). Governor Gonzalo Méndez de Canzo was the first governor to build his residence on the present Government House site in 1598.A new structure was built on the site in 1706 for use as a residence, office, courthouse, and the social center of the town. The east wing of the present building dates to the original construction between 1706 and 1713. Due to the 1763 Treaty of Paris, Florida passed into British ownership. During the British Period, the house was the official residence of James Grant, the British royal governor of East Florida (1764–1771). Among his guests were American explorer Daniel Boone, who was in East Florida to inquire about land purchases, and Patrick Tonyn, who was appointed as Grant's successor. At the close of the American Revolution, Florida and St. Augustine were returned to Spain by the 1783 Treaty of Paris. General Nathanael Greene visited Government House in 1784, hosted for an elaborate seven-course meal by Governor Vicente Manuel de Zéspedes. From 1785–87 the governor’s residence again underwent major renovation. The last governor to use the house was Enrique White during the Second Spanish Period; he died in 1811. By the time Florida was annexed by the United States in 1821, the building was in ruins with only the walls remaining. In 1833–34 Government House was rebuilt with federal funds, following plans drawn up by architect Robert Mills, later famous for designing the Washington Monument. The structure incorporated existing walls and contained 16 rooms, including space for a post office, a courtroom, and other federal functions. During the American Civil War federal troops were headquartered in the building. In 1873 another major remodeling took place, using plans by architect William M. Kimball. Through the next 60 years the post office and customs house gradually took over more and more of the building as the town grew. In 1937, Government House was once again renovated by Jacksonville architect Mellen Clark Greeley as a Works Progress Administration (WPA) project. The U.S. Postal Service continued to use the building until 1965, when a new post office building was constructed. Government House was transferred to the State of Florida in February 1966 as a public monument to be administered by the St. Augustine Historical Restoration and Preservation Commission (later renamed the Historic St. Augustine Preservation Board). The Historic St. Augustine Preservation Board used the 1937 wing of the building for a research library, archaeological and curatorial laboratories, and historical displays until the board became defunct in 1997. Today, the ground floor of the building is open to the public as Governor’s House Cultural Center and Museum, managed by UF Historic St. Augustine, Inc. A research library managed by the George A. Smathers Libraries at the University of Florida is housed on the second floor. During their tour of St. Augustine on April 1, 2001, King Juan Carlos and Queen Sofía of Spain made a public appearance on the east balcony of Government House. King Felipe VI and Queen Letizia of Spain also visited Government House on September 17, 2015.Government House was added to the National Register of Historic Places on January 7, 2014.

St. Francis Barracks is a historic structure constructed of coquina stone located on Marine Street in St. Augustine, Florida, named in honor of St. Francis of Assisi. The barracks were constructed between 1724 and 1755 by friars of the Order of St. Francis, to replace a series of wooden buildings which had been destroyed by the ravages of the tropical climate in La Florida and by fire, both accidental fires and occasional intentional ones, such as when the city was razed by the English in 1702.The barracks were turned into a military structure by the British in 1763, after Florida became a British possession at the conclusion of the French and Indian War. At that time, the Franciscan friars vacated St. Augustine, along with a majority of the other Spanish residents. The name St. Francis Barracks also came to be applied to the larger military reservation which developed around the barracks on the shore of the Matanzas River. There are several additional historic structures, to include senior military officer housing and The King's Bakery, the latter being the only extant structure in St. Augustine constructed entirely within the twenty-year period of the British occupation. Today the St. Francis Barracks is a U.S. military installation that is also known as the Florida State Arsenal and serves as the headquarters for the Florida National Guard and its two subordinate organizations, the Florida Army National Guard and the Florida Air National Guard. A portion of the military reservation is also the site of the St. Augustine National Cemetery.