Prkprescott · CC BY-SA 4.0Humaitá: ruinas de la iglesia de San Carlos y la fortaleza
The shell-torn church that became a national symbol, next to the fortress that held back three armies.
What it is
On the bluff above the Paraguay River stand the remains of the Church of San Carlos Borromeo: a facade and brick towers pierced by artillery fire, silhouetted against the sky. It is one of the most powerful images in the country. Around it stood the Humaitá fortress, the 'key' to the river, with gun batteries, chains stretched across the water and miles of trenches. The former barracks of López house a museum with bullets, swords, stirrups and other relics of the war.
What to see and do
- The ruins of the Church of San Carlos Borromeo
- The museum in the former López barracks
- Remains of the fortress's batteries and trenches
- The view of the Paraguay River from the bluff
- The feast of San Carlos Borromeo (4 November, check before you go)
Did you know…?
The fortress had 12 batteries with some 110 artillery pieces, plus another 40 along a fortified perimeter of about 8 km.
Three heavy iron chains and mines closed the river to the Allied fleet.
History
The fortress, championed by Carlos Antonio López, blocked the Allied advance upriver during the War of the Triple Alliance. The church was inaugurated on 1 January 1861 and destroyed by the bombardments. After two years of resistance, the position was outflanked and abandoned; Brazilian forces occupied it on 25 July 1868.
Tips
- The Municipality of Pilar lists guides for visiting Humaitá (ask at turismo@pilar.gov.py).
- There are few services in town: bring water and fuel from Pilar.
- Combine it with Curupayty on the same day.
Open-air ruins; museum hours vary (check before you go).
Best time: Autumn, winter and spring; in summer, go early because of the heat.
What to try
- River fish back in Pilar
Activities
Festivals and events here
Nearby
Humaitá · Ñeembucú
Curupayty, campo de la batalla de 1866
Where Paraguay's greatest victory of the Great War (the War of the Triple Alliance) was decided along a line of trenches.
Paso de Patria · Ñeembucú
Paso de Patria
The corner where the Paraguay and Paraná rivers meet: fishing, wetlands and memories of war.
Pilar · Ñeembucú
Pilar
A historic town on the Paraguay River: the only surviving colonial cabildo, a marble basilica, wetlands and fishing.
Researched and reviewed in September 2026 with 5 sources. A second reviewer checked dates, coordinates and lodging. Hours and prices may change.