Historical site in Bolívar 65, Plaza de Mayo, Buenos Aires, Argentina
Cabildo de Buenos Aires
The original colonial town hall where the May Revolution of 1810 was plotted and executed. The whitewashed building is the last surviving colonial structure on Plaza de Mayo and houses exhibits on independence history.
The Cabildo de Buenos Aires is the colonial town hall that served as the seat of local government during the Spanish colonial period and played a pivotal role in the birth of the Argentine nation. Located on the western edge of Plaza de Mayo at Bolívar 65, it is the oldest surviving civic building in Buenos Aires and one of the few remaining examples of colonial architecture in the city centre.
The original cabildo was constructed in the early 18th century and expanded throughout the 1700s, eventually taking the form of an elongated whitewashed building with a central clock tower and open arcade. The structure has been significantly reduced over the centuries: portions were demolished in 1889 and again in 1931 to make way for the widening of Diagonal Norte and Avenida de Mayo. The five surviving arches visible today are only a fraction of the original eleven-arch arcade, lending the building a somewhat truncated appearance that itself reflects the city's turbulent urban history.
It was within the Cabildo's assembly room that the defining events of May 1810 unfolded. On 25 May 1810 — now celebrated as Argentina's National Day — local criollos convened an open assembly (cabildo abierto) and voted to remove the Spanish Viceroy, effectively launching the May Revolution and setting Argentina on the path to independence declared six years later in Tucumán. The meeting room where this took place is preserved as a historic chamber within the building.
Today the Cabildo houses the Museo Histórico del Cabildo y de la Revolución de Mayo. The two-floor museum presents artefacts from the colonial period alongside detailed exhibits on the May Revolution and early independence movement. Highlights include period weapons, religious art, documents from the independence era, and an evocative recreation of a colonial-era sala. The interior patio, with its iron well and terracotta-tiled floor, offers a quiet retreat from the surrounding plaza.
Highlights
- Site of the 25 May 1810 cabildo abierto that launched Argentina's independence movement
- Last surviving colonial structure on Plaza de Mayo, with original 18th-century whitewashed arcade
- Museo Histórico del Cabildo y de la Revolución de Mayo with colonial artefacts and period rooms
- Tranquil interior courtyard with original terracotta tiles and iron well
Tips
- Visit on a Thursday or Friday when the museum is quieter — weekends draw school groups and tour parties.
- The small admission charge (around ARS 5 USD equivalent) includes access to all floors; audio guides may be available in Spanish.
- Combine with Casa Rosada directly across the plaza for a focused morning on Argentina's political history.
- The second-floor balcony offers one of the best vantage points for photographing the plaza and surrounding colonial streetscape.
- On 25 May each year the plaza hosts Argentina's National Day celebrations, making the Cabildo the symbolic centre of festivities.
FAQ
What is the significance of 25 May 1810 at the Cabildo?
On that date, Buenos Aires citizens held an open assembly (cabildo abierto) inside the building and voted to depose the Spanish Viceroy. This act, known as the May Revolution, is considered the founding moment of Argentina as a self-governing entity and is celebrated annually as Argentina's National Day.
How long does a visit to the Cabildo museum take?
A thorough visit covering both floors and the courtyard takes around 45 to 60 minutes. The museum is compact and well-labelled, making it manageable even on a tight schedule.
Are exhibits available in English?
The permanent exhibits are primarily labelled in Spanish. Some informational panels include English summaries, but visitors who do not read Spanish will benefit most from a bilingual guided tour or a pre-visit reading on the May Revolution.