How interesting what you comment @storiesoferne, I did not dare to say it in the post because I was not sure, but while I was writing it I remembered that my impression of many elements of the square, including the columns, was that they were carved in travertine marble. Of course, maybe it's another stone with a similar beta, but that was my initial impression.
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No worries. We can always research them online by asking Google haha. 😁 And you're right about the travertine marble. See, it's quite amazing how architecture can transport us to different times and places. I'm glad you have a keen interest in this field.