Archaeology
In the 20th century, Cosa was the site of excavations carried out under the auspices of the American Academy in Rome, initially under the direction of the archaeologist Frank Edward Brown. Excavations (1948–54, 1965–72) have traced the city plan, the principal buildings, the port, and have uncovered the Arx, the forum, and a number of houses. Unexcavated buildings include a bathing establishment, but no trace of a theatre or an amphitheatre has been found. In the 1990s a series of excavations was carried out under the direction of Elizabeth Fentress, then associated with the American Academy in Rome. This latter campaign aimed at understanding the history of the site between the imperial period and the Middle Ages. Sample excavations took place over the whole site, with larger excavations on the Arx, the Eastern Height and around the Forum.
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