The subte línea A (subway "A" line) is one of the oldest in the city and still running almost in the original shape. Take this subway to Castro Barros Station and visit one of the most wonderful cafés in town: “Las Violetas” at Avenida Rivadavia 3899, where many tango singers and writers used to meet. Recently completely renovated you still can feel the amazing atmosphere of the “good old times”. Great pastry!