What is one of the things usually found in the center of a plaza in a spanish speaking country

I think this would be the "Zocalo"

The Zocalo is the base of the Flag, and the national Flag (often very big) is at the center of the plaza in Spanish speaking countries. For example, in Mexico, people refer to this plaza as "Zocalo" for this reason.

Ilike pizza as well

Me iria al centro comercial a comprar un disco de mi banda favorita.iria a un lugar de comida rapida.compraria un boleto para el cine.tomaria un taxi para ir a casa de mi mejor amiga.compraria un libro.