I went to Colonia del Sacramento in March 2013, arriving - unusually - by air. Once our Cub had landed at Colonia's airfield we had to call customs and wait for them to drive over from the town's port in order to stamp our passports. They even gave us a lift into town!

Colonia is a small, low-key affair - not the most interesting WHS in the world. Nevertheless it is a pleasant enough place, and is interesting for its history of contested control by the Spanish and Portuguese colonialists. This is manifested in the different cambers you can see on various streets - here a normal camber with the hump in the middle of the road, there a reverse camber with a dip in the middle of the road!

Uruguay has since been joined on the list by the Fray Bentos Industrial Landscape, which I'd guess might be a bit bleak. But I'll be interested to read the first review when someone on this site visits it.