Piazza del Popolo and Monte Mario

There is a big square not too far from where we live called Piazza del Popolo. One doesn't know where to look first. At the sphinxes?



At the angry fish?



Or perhaps at the obelisk?



Across the Tevere river is a park called Monte Mario, from which one sees views like this



and this



(That's the dome of St. Peter's.)