Stephansplatz

There's much more to see of medieval Vienna, again mainly in the Innerer Stadt, the first district, where you'll see lots of narrow streets, where of course there's the cathedral, begun in 1137, and lots of other churches, including the remains of one called the Virgilkapelle, the Virgil Chapel, which was unearthed unexpectedly in the 1970s.

when workmen were digging out the U-Bahn station, the one called Stephansplatz, which is just right by the cathedral.

If you're passing through that station, keep a look out for the signs, because there's a spiral staircase there, leading right down into it, so you can go and have a look.

Also talking about medieval Vienna, there's the university, founded in 1365, so one of the oldest in the whole of Europe.