Buenos Aires City Hall

The Revolution of 11 September 1852 was a conflict between the Province of Buenos Aires and the government of Justo José de Urquiza after the latter triumphed over Juan Manuel de Rosas at the Battle of Caseros. A period known as "National Organization" was initiated after the Battle of Caseros. Every political faction agreed on authorizing a national Constitution. However, in opposition to the rest of the country, the ruling upper class in Buenos Aires aspired to impose political requirements on the Argentine provinces, so as to maintain the traditional political and economic preeminence of the capital city. The result was a ten-year separation between the Argentine Confederation and the State of Buenos Aires. Both states claimed to be part of a single nation. But in reality, they behaved like separate states.

The Bombing of Plaza de Mayo was a massacre which took place in Buenos Aires, Argentina, on 16 June 1955. On that day, 30 aircraft from the Argentine Navy and Air Force strafed and bombed Plaza de Mayo square in Buenos Aires in the largest aerial bombing ever on the Argentine mainland. The attack targeted the adjacent Casa Rosada, the official seat of government, as a large crowd was expressing support for president Juan Perón. The strike took place during a day of official public demonstrations to condemn the burning of a national flag allegedly carried out by detractors of Perón during the recent procession of Corpus Christi. The action was to be the first step in an eventually aborted coup d'état. The number of identified bodies was put at 308, including six children; an unknown number of victims could not be identified.The disregard for civilian lives and the violence with which the act was carried out has prompted comparisons with the wave of state terrorism during the dictatorship of 1976-1983.

The Plaza de Mayo (Spanish pronunciation: [ˈplasa ðe ˈmaʝo]; English: May Square) is a city square and main foundational site of Buenos Aires, Argentina. It was formed in 1884 after the demolition of the Recova building, unifying the city's Plaza Mayor and Plaza de Armas, by that time known as Plaza de la Victoria and Plaza 25 de Mayo, respectively. The city centre of Buenos Aires, Plaza de Mayo has been the scene of the most momentous events in Argentine history, as well as the largest popular demonstrations in the country. On the occasion of the first anniversary of the May Revolution in 1811, the Pirámide de Mayo (English: May Pyramid) was inaugurated in the square's hub, becoming Buenos Aires' first national monument. It is located in the financial district known as microcentro, within the barrio (English: neighborhood) of Monserrat. It is bounded by Bolívar, Hipólito Yrigoyen, Balcarce and Avenida Rivadavia streets; and from its west side three important avenues are born: Avenida Presidente Julio Argentino Roca, Avenida Roque Sáenz Peña and Avenida de Mayo. In the square's surroundings are several significant monuments and points of interest: the Cabildo, the Casa Rosada (seat of the President of Argentina), the Metropolitan Cathedral, the Buenos Aires City Hall, and the Bank of the Argentine Nation's headquarters. Underneath its lands are the Underground stations of Plaza de Mayo (Line A), Catedral (Line D), and Bolívar (Line E).

The Pirámide de Mayo (Spanish pronunciation: [piˈɾamiðe ðe ˈmaʝo]; English: May Pyramid), located at the hub of the Plaza de Mayo, is the oldest national monument in the City of Buenos Aires. Its construction was ordered in 1811 by the Primera Junta to celebrate the first anniversary of the May Revolution. It was renovated in 1856, under the direction of Prilidiano Pueyrredón. In 1912, after having undergone many modifications, it was moved 63 metres (68.9 yards) to the east, with the idea that a much larger monument would eventually be constructed around it. The monument is crowned by an allegory of Liberty, the work of the French sculptor Joseph Dubourdieu. From the ground to the peak of the statue's Phrygian cap, the Pyramid measures 18.76 metres (61.5 feet).

The Equestrian monument to General Manuel Belgrano is a landmark of Buenos Aires, Argentina. It is located at Plaza de Mayo, in front of the Casa Rosada. It depicts General Manuel Belgrano holding the Flag of Argentina, and it is made of bronze over a pedestal of granite.

Plaza de Mayo is a station on Line A of the Buenos Aires Underground. This station belonged to the first section of line opened on 1 December 1913, linking the station with the station of Plaza Miserere.

The Headquarters of the Bank of the Argentine Nation (Spanish: Casa Central del Banco de la Nación Argentina), more often referred locally as Banco Nación Casa Central, is a monumental bank building next to the Plaza de Mayo, founding site of Buenos Aires and host of major events in the history of the country. Designed by renowned Argentine architect Alejandro Bustillo in a Neoclassical style with French influences, the 100,000 m2 (1,100,000 sq ft) building occupies an entire city block and was inaugurated in 1944. With a dome 50 m (160 ft) in diameter, the building is a National Historic Landmark.

Banco de la Nación Argentina (English: Bank of the Argentine Nation) is a national bank in Argentina, and the largest in the country's banking sector.

The National Academy of History of the Argentine Republic (Spanish: Academia Nacional de la Historia de la República Argentina) is a non-profit learned society established to foster the study and dissemination of Argentine history.

The Buenos Aires Metropolitan Cathedral (Spanish: Catedral Metropolitana de Buenos Aires) is the main Catholic church in Buenos Aires, Argentina. It is located in the city center, overlooking Plaza de Mayo, on the corner of San Martín and Rivadavia streets, in the San Nicolás neighbourhood. It is the mother church of the Archdiocese of Buenos Aires and the primatial church of Argentina. The Cathedral of Buenos Aires was rebuilt several times since its humble origins in the 16th century. The present building is a mix of architectural styles, with an 18th-century nave and dome and a severe, 19th-century Neoclassical façade without towers. The interior keeps precious 18th-century statues and altarpieces, as well as abundant Neo-Renaissance and Neo-Baroque decoration.

The Anglo-South American Bank was a British and Argentine bank established with the acquisition of the Anglo-Argentine Bank in 1900 by the Bank of Tarapacá and London. The new bank first took the name of Bank of Tarapacá and Argentina, which it changed in 1907 to Anglo-South American Bank.

The Casa Rosada (Spanish pronunciation: [ˈkasa roˈsaða], English: Pink House) is the office of the president of Argentina. The palatial mansion is known officially as Casa de Gobierno ("House of Government" or "Government House"). Normally, the president lives at the Quinta de Olivos, the official residence of the president of Argentina, which is located in Olivos, Greater Buenos Aires. The characteristic color of the Casa Rosada is baby pink, and is considered one of the most emblematic buildings in Buenos Aires. The building also houses a museum, which contains objects relating to former presidents of Argentina. It has been declared a National Historic Monument of Argentina.