The Pirámide de Mayo, located in the Plaza de Mayo in Buenos Aires, is the oldest national monument in the city.

Built in 1811 to celebrate the first anniversary of the May Revolution, it underwent renovations and relocations over the years.

The monument features an allegory of Liberty at its peak and has historical significance as a symbol of Argentine independence.

It is famous for being the location for the Madres de la Plaza de Mayo's weekly march since the 1970's military dictatorship. When large gatherings and protests were banned, the mothers (demanding the return of their missing children) would gather here and walk in circles around the pyramid. This loophole allowed them to make their claims known without being an official gathering.