Rome is known for it's seven hills which surround the centre of the city. Originally each hill was a separate settlement before the city of Rome was formed. Although, Gianicolo Hill is not included as one of the seven (as it was outside the boundaries of the Ancient Rome), it is still seen as one of Rome's Hills.
It is one of my favourite spots in Rome and gives amazing views over the whole of Rome. You can see all the main sights of Rome but from a different prospective. I love sitting up there and looking out at all the layers of history intertwined together to make up the "Eternal City".