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Photo: Fulviusbsas, CC BY-SA 3.0 via Wikimedia Commons
Everyone wandering around the barrio histórico will pass through the main square at some point. It is lined by several points of interest for travelers such as museums, places to eat, drink and sleep, and some small stands selling souvenirs. On the western edge there are old cannons laying on the ground and in the middle there is a palm functioning as an electrical pole and a lamp post complete with a fuse box and even electrical sockets! If you wonder about the noise from the palms, it's from small green parrots that have their nests there.
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Museo del Período Histórico Portugués
In this 18th century building, objects from the time when Colonia was a part of the Portuguese empire are on display including the coat of arms that was mounted on the city gate.
Museo Naval
Probably Colonia's most famous street and the view along the street towards the main square is featured on many tourist related publications of the town. The name of the street translates to "the street of sighs". There are two stories of how the street got its name: either because the houses along it used to be brothels, or because prisoners were brought along it before being put to death.
Archivo Histórico Regional
The house was built by the Portuguese in the 18th century and called "Casa de Palacios". The museum shows documents from the various epochs in Colonia's history.
Casa de Nacarello
A Portuguese 18th-century building: an example of a furnished home from those times.
Small brick ruin between the lighthouse and the main square. You would not know what kind of building it was if there weren't a sign next to it.