7 Historic Churches in Buenos Aires Beyond the Cathedral
The Metropolitan Cathedral gets all the attention on Plaza de Mayo, and fair enough. But Buenos Aires has a much broader religious heritage: colonial churches with tunnels underneath, a mausoleum draped in war flags, the biggest organ in South America. None of these seven require you to be a believer to enjoy them -- just an interest in history, architecture, or finding a quiet corner in a city that never really slows down.
1. Iglesia de San Ignacio de Loyola (Monserrat)
The oldest building still standing in Buenos Aires. The Jesuits built it between 1686 and 1722, and it's part of the Manzana de las Luces, one of the city's most important historic complexes. Colonial-era tunnels run underneath, once used for defense and smuggling, now part of the site's guided tour circuit. Declared a National Historic Monument in 1942.
Address: Bolivar 225, Monserrat -- near the Catedral (Line D), Bolivar (Line E) and Peru (Line C) subway stations.
2. Basilica Nuestra Senora del Pilar (Recoleta)
The second-oldest church in the city, opened in 1732 for the Recollect Franciscans. It sits literally next door to Recoleta Cemetery, and its white, asymmetrical facade -- attributed to Jesuit lay brother Andres Blanqui -- is one of the neighborhood's most photographed sights. Inside, a small cloister museum holds religious vestments, paintings and colonial-era objects.
Address: Junin 1904, Recoleta.
3. Basilica de San Francisco (Monserrat)
Part of the Franciscan Block, alongside the Capilla de San Roque. It's one of the city's oldest churches, with a history of collapses and rebuilds -- including its facade falling down in 1807 -- that eventually led to the current version, completed in 1911. It reopened to the public in 2024 after a full restoration. It sits just steps from Plaza de Mayo, in an area Jorge Bergoglio used to frequent as archbishop.
Address: Alsina 380, Monserrat.
4. Basilica de Santo Domingo (Monserrat)
This is the one to see if military history interests you as much as religious history. In the atrium sits the mausoleum of General Manuel Belgrano, creator of the Argentine flag. Inside, in the Virgin's chamber, you'll find the English flags Santiago de Liniers captured during the British Invasions of 1806 and 1807 -- and one of the towers still bears bullet marks from those battles.
Address: Avenida Belgrano and Defensa, Monserrat.
5. Iglesia y Monasterio de Santa Catalina de Siena (Monserrat)
Construction began in 1738 on plans by Andres Blanqui, and it became Buenos Aires's first Dominican convent. It's less visited than the churches above, which makes it one of the quietest corners of the historic center to sit down for a while.
Address: San Martin 705, Monserrat.
6. Basilica del Santisimo Sacramento (Retiro)
The most lavish entry on this list. Mercedes Castellanos de Anchorena commissioned it in the early 20th century, hiring French architects and importing materials from Europe: Carrara marble, Moroccan onyx, French stained glass. It holds the largest organ in South America -- nearly 5,000 pipes, installed in 1915. It was consecrated in 1916, and Pope Benedict XV raised it to Minor Basilica status that same year.
Address: San Martin 1039, Retiro.
7. Metropolitan Cathedral (San Nicolas)
It had to make the list, even though it has its own full guide: the seat of the Archdiocese of Buenos Aires, home to General San Martin's tomb and fifteen years of Jorge Bergoglio's history as archbishop before his election as Pope Francis.
Address: Av. Rivadavia and San Martin, facing Plaza de Mayo.
How to build your own route
The first six -- San Ignacio, Pilar, San Francisco, Santo Domingo, Santa Catalina and the Cathedral -- are all within easy walking distance across Monserrat and San Nicolas, so you can string them into a single morning. The Santisimo Sacramento is a bit further out, in Retiro, but works well if you're already headed toward Plaza San Martin or the Torre Monumental. Avoid mass times if you want an unhurried look around, and confirm opening hours before you head out -- they shift between weekdays and weekends.
If you'd rather walk the route with context instead of hunting down information church by church, Trevurs has a free audio tour of the historic center and another of Recoleta, made by people who actually live in Buenos Aires -- start them whenever you want and work through each stop at your own pace.
Heritage that doesn't depend on any one visit
These seven churches have been here for centuries, long before any papal visit or calendar date, and they'll still be here after. If this route caught your interest and you want to go deeper neighborhood by neighborhood, Trevurs has free audio tours of Buenos Aires made by locals -- the best way to get to know the city without a printed guide or a group stuck to a fixed schedule.