See

Castellu d’Araghju

Photo: Julian Nyča, CC BY-SA 3.0 via Wikimedia Commons

About

The remains of prehistoric fortifications (c-ca 2000 BC).

Araghju is an archaeological site in Corsica. It is located in the commune of San-Gavino-di-Carbini.
From Wikipedia · Araghju

Guide text adapted from the Wikivoyage article "Porto-Vecchio" by its contributors, available under CC BY-SA 4.0. Read on Wikivoyage · Contributors · CC BY-SA 4.0
Summary from the Wikipedia article "Araghju", available under CC BY-SA 4.0. Wikipedia
Photo: Julian Nyča, CC BY-SA 3.0 via Wikimedia Commons