The original building was much larger; its side wings were truncated in the 1930s and 1940s to make room for the construction of Avenida de Mayo and Diagonal Sur.
The first cabildo (municipal building) was built on this site in 1580, though the current structure dates back to 1728.
It served as both the seat of the city council and a prison during the colonial period.
The building houses the remains of a colonial-era bell that historically alerted citizens to political changes.
The collection contains items such as the original 1810 printing press used to produce the Gaceta de Buenos Aires.
The balcony remains the most symbolic feature, marking the spot where the first local government junta was presented to the public in 1810.
The Museo Nacional del Cabildo serves as the primary historical site commemorating the May Revolution of 1810, which initiated the Argentine War of Independence. Originally constructed in the early 18th century to house the city's colonial government, the building underwent significant structural modifications, including the shortening of its wings to accommodate modern street expansions. The museum collection focuses on the administrative and political evolution of the Viceroyalty of the Río de la Plata. Visitors explore a variety of colonial artifacts, religious art, and personal effects belonging to figures involved in the nation's independence movement. The architecture maintains a distinct Spanish colonial style, characterized by its iconic white facade and arched portico. It is currently under the administration of the Argentine Ministry of Culture and serves as a center for historical research and public education. The exhibition spaces span two floors, arranged around a central open-air patio.
From the center of Plaza de Mayo, facing the building to capture the full white facade against the sky.
Walk through the central patio to see the classic colonial architectural layout.
Ask the staff about the location of the 18th-century well in the courtyard.
Check the official website for temporary exhibitions that often rotate through the upper-floor galleries.
Do not mistake the museum for the neighboring government offices; use the main entrance facing Plaza de Mayo.
Closed on Mondays and Tuesdays.
