Answer
The Portuguese governor’s house, of which only ruins remain, dates from the 1760s–1770s. The site is in Colonia and helps reveal the Portuguese layer of the city’s history.
These ruins are best understood not as an isolated photo opportunity but as part of the old urban fabric. Around them, one gets a sense of the scale of former development, the colonial past, nearby squares, and shifting influences in the region.
On a route through Colonia, the ruins can easily be combined with Plaza Mayor, museums, the basilica, and the lighthouse. This itinerary offers more context than a quick visit: the site is best understood as a fragment of the historic center. Its value becomes clear alongside other traces of historic development.