sentences:  These buildings are separated by a pedestrian passage called Pasaje Juramento, leading to the National Flag Memorial.The Memorial's propylaeum and stone tower can thus be clearly seen from the plaza.At the center of the plaza there is a monumental column dedicated to national freedom ("Columna à la Libertad"), with a statue representing Liberty standing on top, and surrounded by the statues of national heroes José de San Martín and Manuel Belgrano, journalist and independence activist Mariano Moreno, and first Argentine president Bernardino Rivadavia.