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Viewed from Bastión de San Pedro, the southwestern most point of Colonia, this is an interesting, great natural spectacle. In the middle of February, the sun dips down during sunset right where you can find Buenos Aires at the horizon. In other words, on a clear evening it seems to sink into the Argentinian capital on the other side of the river with its skyscrapers and high buildings. If you have a good zoom, this allows for a great picture. Of course, do not look directly into the sun.
© OpenStreetMap contributors
A farm outside of Colonia with an animal reserve and two unique attractions.
Plaza de Toros
Outside of the city is Uruguay's only bullfighting ring that is almost "unused". It was finished in 1910 with room for 8,000 spectators, but bullfighting was banned by law in the country two years later. The ring is now abandoned to total disrepair and fenced off for visitors' safety.
Museo Paleontológico Armando Cancaterra
Fossils, including a glyptodon, and other paleontological and archeological discoveries on display.
Like Montevideo, Colonia has a sign by the water displaying the city's name in big white letters, though this one is newer (installed in 2017) and less well known. A popular spot for taking pictures.
Muelle
Built in 1866 as the city's port, before the new port was built on the other side of the peninsula. Relax on the water and see the yachts and views of the northern part of the city.