This is just to the right of the gate in the previous shot. The bell tower belongs to the Chiesa di San Pietro, also known as the Church of St Peter, also known as the Chiesa Abbazia di San Pietro since it is in fact an abbey run by a community Benedictine Cassinese monks. The original church was built in the 10th Century but was rebuilt in the 13th century.

It sits on the Piazza di San Pietro, which you arrive at immediately upon going through the gate in the previous shot. Whether the church was named after the Piazza, or the piazza was named after the church, I have no idea but I suspect the latter.

There is a line of taxis sitting just outside the city walls alongside the gate. This isn't all that surprising, since if a visitor comes to Assisi by train, the station is not in the town itself. (Being on a hillside, the geography isn't particularly amenable to rail lines.) The station is about 4 km away in the nearby frazione (a small village outside the main town) of Santa Maria degli Angeli. We shall speak further of that place in a later shot. In any case, if you don't have a car (and, if you're from overseas, an international drivers' license), a taxi is going to be the easiest way to get up to the town itself, or down to the station after you're done. It's not surprising that there is a bountiful supply of them.