Tongobriga

Ruins of a Galician-Roman city near the village of Freixo in Marco de Canaveses, approximately 54 km east of Porto in northern Portugal. Built in the late 1st century AD over an Iron Age Castro culture hillfort, Tongobriga became an important Roman administrative center with an estimated 2,500 residents. Excavations spanning 75 acres have revealed a large forum, thermal baths, a theater, amphitheater, residential areas, and a necropolis. The site has been classified as a National Monument since 1986.