The Romkert, or Garden of Ruins, preserves a stretch of Roman Savaria right behind the cathedral. You walk over original mosaic floors of the imperial palace, a stretch of the Amber Road, and the foundations of a late-antique basilica.
It is one of the more substantial Roman sites in Hungary — modest compared to Aquincum in Budapest, but unusual in that it sits in the middle of a working city centre. A small admission applies. Allow an hour.