Just north of Colonia del Sacramento is a large complex in Real de San Carlos, built as a tourist attraction during this time. The highlight is perhaps the giant bullring, but the nearby hotel and racetrack are just as interesting, if only because the bullring has not been operational since Uruguay outlawed bull fighting shortly after it was built. Again, other than this complex there is little architecture of note until later in the century.
A city with more modern architecture, along with some experimentation of architecture is Punta del Este. Perhaps the most impressive architectural feat is Casa Pueblo just outside of town in Punta Ballena. This unconventional shaped house is quite unusually as it also boasts great views. However, the more popular landmark in Punta del Este is the giant hand sculpture coming out of the sand.
Despite the lack of architectural masterpieces, the capital of Montevideo boasts a decent mix of buildings from nearly every time period as it is home to colonial architecture as well as a fairly modern skyline.