Near the Rhine just east of Basel, Switzerland’s largest Roman ruins are the last remnants of a colony founded in 43 BC, the population of which grew to 20,000 by the 2nd century AD. Today, visitors can stroll at will through a hodgepodge of ruins, highlighted by the best-preserved Roman theatre north of the Alps.
To reach Augusta Raurica, take the twice-hourly S1 from Basel to Kaiseraugst (Sfr5.60, 11 minutes), then walk 10 minutes, following signs to the site.
At the entrance to the site, the Römermuseum is also well worth a visit for its authentically restored Roman house and its unparalleled 270-piece collection of late antique silver.