Fodor's Expert Review Museo Histórico Nacional del Cabildo y de la Revolución de Mayo

Plaza de Mayo's only remaining colonial edifice was built in 1765 as the meeting place for the city council, now based in the ornate wedge-shaped building on the southwest corner of the square. The epicenter of the May Revolution of 1810, where patriotic citizens gathered to vote against Napoleonic rule, the hall is one of Argentina's national shrines. However, this hasn't stopped successive renovations to its detriment, including the demolition of the whole right end of the structure to make way for the new Avenida de Mayo in 1894 and of the left end for Diagonal Julio Roca in 1931. The small museum of artifacts and documents pertaining to the events of the May Revolution is less of an attraction than the building itself. Thursday and Friday from 11 to 6, a tiny craft market takes place on the patio behind the building.