Museu de Portimão is one of the best regional museums in the Algarve, housed in a converted sardine-canning factory on the Arade waterfront. The building itself is a significant piece of industrial heritage from the early twentieth century, and the conversion has preserved the factory floor and much of its original equipment.
The permanent collection covers the history of Portimão from prehistoric times through the Roman occupation to the modern era, with the fishing industry at its heart. There are good displays on the archaeology of the Arade River — boats, cargo, and the accumulated debris of centuries of river commerce — and an evocative reconstruction of the canning factory at work. Entry is free on the last Sunday of each month. The waterfront terrace café is a pleasant place for a coffee after visiting.