Question

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

Answer 1

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.

Answer 2

There are many things you can find plaza the mayor, house of Gallardo, plaza colon...