Merchants' Gate

From Witcher Wiki

The Merchants' Gate is where Geralt first encounters Mikul, one of the Outskirts' most prominent citizens, at least according to the Reverend. The Merchants' Bridge leading up to it is also the scene of a Salamandra ambush involving Kalkstein.

These gates remained locked for the duration of the game. Although Geralt does see both sides of them, he never actually passes through them..