The rock sculptures at the Sacro Bosco or Parco dei Mostri (Sacred Wood or Monster Park) show a lot about the garden's creator, Vincino Orsini, a military commander. In this garden, he embraced existing natural rock formations to create fantastical creatures. What is quite amazing is that this garden was built in the same period as the Italian renaissance gardens at Villa d'Este. One story has it that the garden only became well known after Salvador Dali publicized his visit in 1948.
A good garden reflects the personality of its creator and the nuances of the specific site. A person's style, passion, interests and outlook on life should come through, as well as how that person has worked with nature. Good gardens are not about replicating someone else's garden, they are about being unique.
Check out posts that show other examples of how gardens show the personality of their creators.