1. Plaza de Mayo is the historical and political heart of Buenos Aires, Argentina. It was named after the May Revolution of 1810, which marked the beginning of Argentina’s independence from Spain. It has been the site of many important events in Argentine history, including protests, massacres, and political rallies. The plaza is surrounded by important buildings, such as the Casa Rosada (the presidential palace), the Metropolitan Cathedral, and the Banco de la Nación. Visitors can see the famous Pirámide de Mayo, a white obelisk erected in 1811 to commemorate the revolution. The plaza is also famous for the Madres de Plaza de Mayo, a group of mothers who have been protesting for decades to demand justice for their children who disappeared during the Dirty War in the 1970s.
2. Plaza de Mayo is open 24 hours a day, 7 days a week. There is no phone number specifically for the plaza as it is a public space.
3. There is no ticket required to enter the plaza as it is a public space. It is easily accessible by public transportation as it is located in the center of Buenos Aires. The closest subway stations are \"Plaza de Mayo\" (Line A) and \"Catedral\" (Line D). Buses also stop nearby.


