There is a statue of a standing man in the center of the square, surrounded by lawns and a pair of benches. There are many pigeons here. This is a low-key, civil-level small square, with few people, very clean, and a good place to rest.
Piazza San Marco is also a very good facility. You can see a lot of objects around this square, as well as interesting historical landscapes. The construction of Piazza San Marco is also quite fun.
St. Mark's Square is quite large, a rectangular area. There is a cathedral next to it, and the traffic on the square is very large. Basically, if you want to take pictures, there is a human background wall behind.
A nice piazza to sit and take a break, maybe even feed the birds (which is what I did). The surrounding area is peaceful and nice to look at.
This square has a lot of traffic, and there are also small commodities on the side, you can buy some small gifts as souvenirs to take home.