Trier

The Porta Nigra, a Roman city gate

We ventured out to Trier with the intent of visiting the Christmas market, which we did, but we found much more to look at and enjoy in the Roman ruins around the city.  Plus the Karl Marx house, which was covered in scaffolding. 

We conducted exhaustive testing of the acoustical qualities of the ampitheatre.  Also, my kids were wondering why they haven't ever seen a gladiator fight.  Bloodthirsty little tykes.