[3] In 1929, Antoine de Saint Exupéry made an emergency landing in the castle gardens.

[5] The building served as a place for the creation of candles, a fruit stand and a salting establishment.

In 2008, the first works of renovation of the building were started by the government of the municipality of Concordia, the Architects Council of the province of Entre Ríos and the Advisory Commission of the Special Fund of Salto Grande.

The people in charge of the restoration of the Castillo San Carlos won the "Prize for the Best Intervention of more than 1000m2" awarded by the International Conservation Center and the Central Society of Architects.

[6] In October 2020, activities were held for the anniversary of the Castle in which the importance and history of the building in Concordia was discussed.