The structures and statues in the park are a sign of respect. The half round building is dedicated to Galileo. It is a small observatory. 5Did you know that already in 600 BC people knew the earth was round and was circling around the sun?)
Here is Dante, with the Divina Comedia open on his lap on a page against the then rulers of Firenze who banished him forever from his beloved city.
Of course I read the Bell on top of the Pantheon as the bell of freedom. Here you see a prime example of trompe oeil in the Pantheon. and the declaration of intent: no immages of tyrants.... only of those who brought hope for futere lives.