Right behind Neptune, there’s a place that is sometimes overlooked by tourists - Biblioteca Sala Borsa, one of the biggest (and most loved) libraries in the city. You’ll want to see it! It’s a real artwork inside, and it was actually built on the ruins of the Roman city of Bononia that you can see thanks to glass floors - or by going underground! There’s an entrance there on the -1st floor and the contribution for entry is voluntary. Not convinced yet? There are Etruscan remains as well, preceding the Roman ones, and the library itself is home to the only covered square in the city - Piazza Umberto Eco - that once was an open-air botanic garden!