This is a day of gradual northward unfolding — from the dense capital into the open pampas, with a long stop at Argentina's most visited shrine and a riverside lunch before the highway delivers you into the country's third city. The landscape stays flat the entire way, but the stops give the day its shape.
Morning: Luján
The day begins at eight from Buenos Aires, threading south through the city before picking up the Autopista Perito Moreno westbound. By the time the urban fabric thins, the road has become the Acceso Oeste — Ruta Nacional 7 — and the pampas stretch away on either side, flat and open. A toll at Peaje Luján marks the edge of the metropolitan zone; from here it is a short run into the city, arriving around nine.
Luján has been drawing pilgrims for nearly four centuries. The story behind the Basílica de Nuestra Señora de Luján begins in 1630, when a cart carrying two terracotta statues of the Virgin — ordered from Brazil by a Portuguese landowner in Santiago del Estero — became inexplicably immovable at a ford on the Luján River. The ox team would not budge until one of the statues, the Immaculate Conception, was removed from the load. The witnesses read this as a sign; the image stayed. A succession of chapels and shrines followed over the next two centuries, until the current neo-Gothic basílica was begun in 1887 and completed in 1935. Its two 106-metre towers are visible from the approaches to town, rising well above the surrounding plain. Inside, beneath the high altar, the original terracotta figure stands in a camarín dressed in white and sky blue — the same blue and white that Manuel Belgrano later chose for the Argentine flag, colours already associated with the Immaculate Conception of Luján. General San Martín laid his sword at this shrine after his Andean campaigns; Pope John Paul II came in 1982. Six million people visit annually, including the roughly one million young pilgrims who walk the 68 kilometres from Buenos Aires every October in an overnight procession.
The basílica interior rewards a slow walk, particularly the stained glass and the crypt. Directly across the plaza, the old Cabildo now houses the Complejo Museográfico Enrique Udaondo, a rambling collection covering colonial history, transport, and pre-Columbian artifacts — including horse-drawn carriages, early automobiles, and a tank. The plaza itself, flanked by souvenir stalls and a riverside park, frames the basílica to good effect; the best full view of the facade is from the far side of the square.