"The entire Borghese Gardens park was organized on a formal, symmetrical plan with lanes and small squares lined with statues and fountains. The giardini segreti (secret gardens) located on either side of casino were the most important and well-tended of the gardens. Since the Renaissance, secret gardens, whose roots lie in the kitchen gardens of Medieval convents, have been a common garden type. Their name is an allusion to the fact that they are enclosed by walls that form outdoor rooms, thereby creating a private passage from the closed, interior spaces to the open air of the surrounding park. Between the gardens is a pavilion called “l’Uccelliera,” (the Aviary), which was constructed to house a prized collection of rare and exotic birds.