I am not so sure but I think they are Banyan Trees. In Wikipedia, it is stated that this tree is special to İndia but I saw them in Alicante.
Wikipedia gives the following information on the tree.
In the Gujarati language, banya means "grocer/merchant," not "tree. English writers began to tell of the banyan tree, a tree under which Hindu merchants would conduct their business. The tree provided a shaded place for a village meeting or for merchants to sell their goods. Eventually "banyan" became the name of the tree itself.