The great outside basin of the Baths of Agrippa was built towards the Pantheon.

The great gardens of Agrippa (Horti Agrippæ) were adjacent to the Baths of Nero and in the centre of these gardens was built a huge artificial lake (or Agrippa’s lake) surrounded by a portico, the Portico Bonus Eventus.

The portico and the temple Bonus Eventus that dates up to the end of the first century BC. Today this site is occupied by the church of Santa Maria in Monterone.

Between the Baths of Agrippa, the Portico of the Argonauts and the Pantheon, stood Basilica of Neptune, necessary annexe of the public square. The environment of the Baths of Agrippa offered to the Romans an oasis of beauty and quietness.