The Citadel of Pisa is a fortress in the north part of the river Arno, at end of Lungarno Simonelli, it was build to guard the access by the river Arno, and the shipyard in the middle ages, when the sea was closer to the city. Near the citadel are still the remains of the arsenals of the Republicans and the Medicis. Also the Guelph Tower, which was reconstructed after WWII, is open to the public, and from there you can have an amazing view of this beautiful city.
More images click here: La Cittadella
The Scotto Garden is situated in the opposite part of La Cittadella, called the new Citadel which is another fortress built by the Florentines after their second conquest of the city of Pisa. At the end of the eighteen century, when the fortress was not useful anymore, it was sold to the church, and then to the Scotto family, a wealthy family from Livorno.
Here they build this beautiful garden that overlooks again the city and it is open in the summer for concerts, and open air cinema.
More images click here: Giardino Scotto
For information for the summer program at the Giardino Scotto contact firstname.lastname@example.org