 The oldest construction on Formentera a dolmen, or prehistoric stone circle lies not far from Es Pujols at Ca Na Costa (between the La Sabina road and Formentera's salt lake).
On Formentera, the oldest construction is from Roman times.
mnli hypothesis: On Formentera, the oldest construction is from Roman times. premise:  The oldest construction on Formentera a dolmen, or prehistoric stone circle lies not far from Es Pujols at Ca Na Costa (between the La Sabina road and Formentera's salt lake).