Termas de São Pedro do Sul — Portugal's Oldest Thermal Spa

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Termas de São Pedro do Sul holds the distinction of being both the oldest and most visited thermal spa in Portugal, with Roman-era changing rooms still visible at the site proving continuous use since the Roman conquest. Set in a lush river valley of the Vouga River, roughly 70 km from Porto, the thermal complex channels naturally hot sulphurous water (around 35°C) through a variety of classical bath formats: Roman baths, showers, aerobaths, and modern hydrotherapy pools. Day spa access for a basic thermal session runs approximately €20-35 per person depending on the package; specialised treatment courses start higher. The surrounding town of São Pedro do Sul is a charming thermal resort town with cafés and gardens — come for the morning session, have lunch by the river, and return via Viseu, a pretty historic city en route back to Porto.

Seasonal note: Open year-round; thermal waters are especially appealing in cooler months. Portugal's oldest documented thermal spa, used since Roman times.