The historic district of Colonia del Sacramento in Uruguay has been designated as a World Heritage site. There you will find the Porton de Campo, the old city gate.
The city's history is a continuous back and forth battle between the Portuguese and Spanish from 1680 on. In 1828 it became part of the independent country of Uruguay. The city is a photographer's paradise with beautiful sites around every corner. I'll show more photos from here in the future. It was one of my favorite South American stops.