Which city's metro includes a station called 'Plaza de Mayo'?

The city whose metro includes a station called Plaza de Mayo is Buenos Aires. The station is on Line A of the Buenos Aires Underground, commonly called the Subte.

Plaza de Mayo opened on 1 December 1913 as part of the first section of Line A, which linked Plaza de Mayo with Plaza Miserere. This made it part of one of the earliest underground railway routes in Latin America.

The station stands in Montserrat, at the historic heart of Buenos Aires, near the Casa Rosada, the Metropolitan Cathedral and the Buenos Aires Cabildo. It is named for Plaza de Mayo, the city’s central civic square and a major site for public ceremonies, demonstrations and political gatherings.

Quiz players sometimes confuse the station with the square itself. “Plaza de Mayo” can refer to both, but the question’s metro clue points to Buenos Aires’s Line A station, not a station in Madrid, Barcelona or Lima. The station was declared a national historic monument in 1997.