Is there an official name for the Old Bridge and the Bridge Gate with the twin white towers or is that what they're really called? Also, what is the name of the church directly south of the Gridge Gate?
It's called Alte Bruecke - Old Bridge-in all official publications that I've seen.
The name of the church at Bridge Gate (=Gridge Gate??) is Heiliggeistkirche - Chuch of the Holy Spirit.