Three tall Corinthian columns standing on a small grassy esplanade between the old town and the lakefront, the most visible Roman remains in Nyon. The columns were re-erected in 1958 from original 1st-century fragments excavated from the foundations of Colonia Iulia Equestris's basilica — the building whose remains are visible underground in the Roman Museum next door.
The setting is everyday Nyon — the columns sit in a small park used by lunchtime office workers and joggers — but on a sunny day with the lake and the Alps as backdrop, the contrast of Roman stone against a Swiss view is striking. Always open; no admission.