Piazza San Marco in the context of San Marco (sestiere of Venice)

The Patriarchal Cathedral Basilica of Saint Mark (Italian: Basilica Cattedrale Patriarcale di San Marco), commonly known as St Mark's Basilica (Italian: Basilica di San Marco; Venetian: Baxéłega de San Marco), is the cathedral church of the Patriarchate of Venice; it became the episcopal seat of the Patriarch of Venice in 1807, replacing the earlier cathedral of San Pietro di Castello. It is dedicated to and holds the relics of Saint Mark the Evangelist, the patron saint of the city.

The church is located on the eastern end of Saint Mark's Square, the former political and religious centre of the Republic of Venice, and is attached to the Doge's Palace. Prior to the fall of the republic in 1797, it was the chapel of the Doge and was subject to his jurisdiction, with the concurrence of the procurators of Saint Mark for administrative and financial affairs.

San Marco is one of the six sestieri of Venice, lying in the heart of the city as the main place of Venice. San Marco also includes the island of San Giorgio Maggiore. Although the district includes Saint Mark's Square, that was never administered as part of the sestiere.

Jacopo d'Antonio Sansovino (2 July 1486 – 27 November 1570) was an Italian Renaissance sculptor and architect, best known for his works around the Piazza San Marco in Venice. These are crucial works in the history of Venetian Renaissance architecture. Andrea Palladio, in the Preface to his Quattro Libri was of the opinion that Sansovino's Biblioteca Marciana was the best building erected since Antiquity. Giorgio Vasari uniquely printed his Vita of Sansovino separately.

45°26′05″N 12°20′20″E / 45.43471°N 12.338912°E / 45.43471; 12.338912

The Clock Tower in Venice is an early Renaissance building on the north side of the Piazza San Marco, at the entrance to the Merceria. It comprises a tower, which contains the clock, and lower buildings on each side. It adjoins the eastern end of the Procuratie Vecchie. Both the tower and the clock date from the last decade of the 15th century, though the mechanism of the clock has subsequently been much altered. It was placed where the clock would be visible from the waters of the lagoon and give notice to everyone of the wealth and glory of Venice. The lower two floors of the tower make a monumental archway into the main street of the city, the Merceria, which linked the political and religious centre (the Piazza) with the commercial and financial centre (the Rialto). Today it is one of the 11 venues managed by the Fondazione Musei Civici di Venezia.

The Loggetta is a small, richly decorated building at the base of the bell tower in Saint Mark's Square, Venice, Italy. Built by Jacopo Sansovino between 1538 and 1546, it served at various times as a gathering place for nobles and for meetings of the procurators of Saint Mark, the officials of the Venetian Republic who were responsible principally for the administration of the treasury of the Church of Saint Mark and for the public buildings around Saint Mark's Square.

Because of its location directly in front of the Porta della Carta, the most important entry to the Doge's Palace, the loggetta was also used from 1569 onward as a sentry post to provide security for the assembled nobles during the meetings of the Great Council: three procurators were to be present, assisted by an armed squadron of workers from the Arsenal, the government shipyard, in order to counter any popular assault and respond to any fire. Beginning in 1734, it was additionally the site for the extraction of winning tickets in the public lottery.

St Mark's Campanile (Italian: Campanile di San Marco, Venetian: Canpanièl de San Marco) is the bell tower of St Mark's Basilica in Venice, Italy. The campanile is a reconstruction completed in 1912, the previous tower having collapsed in 1902. At 98.6 metres (323 ft) in height, it is the tallest structure in Venice and is colloquially termed "el paròn de casa" (the master of the house). It is one of the most recognizable symbols of the city.

Located in Saint Mark's Square near the mouth of the Grand Canal, the campanile was initially intended as a watchtower to sight approaching ships and protect the entry to the city. It also served as a landmark to guide Venetian ships safely into harbour. Construction began in the early tenth century and continued sporadically over time as the tower was slowly raised in height. A belfry and a spire were first added in the twelfth century. In the fourteenth century the spire was gilded, making the tower visible to distant ships in the Adriatic. The campanile reached its full height in 1514 when the belfry and spire were completely rebuilt on the basis of an earlier Renaissance design by Giorgio Spavento. Historically, the bells served to regulate the civic and religious life of Venice, marking the beginning, pauses, and end of the work day; the convocation of government assemblies; and public executions.