The Great Market Square is one of the main landmarks and tourist attractions of Antwerp.
As for the statue in the middle... It is actually a fountain. The man standing on one leg is waving a hand freshly severed from the body of another one lying at the foot of the fountain. To add more drama, when the fountain is working, a stream of water gushes from the open wound imitating a stream of bloody. A bit gory...
Not everyone knows that the name of the city derives from two words: hand and werpen (to throw) and comes from a legend about a cruel giant who used to cut off people's hands if they refused to pay him money. He was eventually slayed by a young hero named Brabo (the bloke on top of the fountain) who then cut off the giant's hand and threw it into the river.
However, some historians argue that Antwerp's name actually means "on the wharf" ( Dutch "an't werf) which makes a bit more sense.