Colonia del Sacramento in Uruguay can be easily reached by boat from Buenos Aires. As soon as you enter the small town, you seem to switch to another time. Old-timers are just as naturally used here to do day-to-day business as antiquated stoves are used to prepare meals, street lighting and much more.It almost seems as if there was a nationwide decision to let time stand still.
Wikipedia: Colonia del Sacramento is a small town on the Río de la Plata in Uruguay.
It is the capital of the Colonia department. Colonia del Sacramento is the oldest city in Uruguay, its old town has been declared a World Heritage Site by UNESCO.