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"Monty Don's Italian Gardens" is one show that fuels my dreams. Monty focusses on Renaissance gardens in Italy in this four part series. The key to gardens of this style were symmetry and harmony.
There is one garden, however, which does not follow the path of Renaissance symmetry - 'Sacro Bosco', or 'Sacred Wood', in the Villa Orsini of Bomarzo. It contains fantastic, gigantic mythological sculptures, carved from the rock, found in the garden. It was designed by the then famous architect, Pirro Ligorio, for Prince Pier Francesco Orsini (1523-1585).
You can watch this episode here (fast forward to time of 35:10):
You can see all the episodes at the TVO website.