Founded by the Portuguese in 1680 on the Río de la Plata, the city was of strategic importance in resisting the Spanish. After being disputed for a century, it was finally lost by its founders. The well-preserved urban landscape illustrates the successful fusion of the Portuguese, Spanish and post-colonial styles.
Since 1995 it is a Unesco site.
Thanks to Pieter for the postcard.
Thanks to Jorge for the postcard.