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He practiced botany in the Gardens of Vatican City , and was commissioned to make plans for the pope 's proposed draining of the Pontine Marshes .
 Gardens of Vatican City, Pontine Marshes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gardens of Vatican City, Pontine Marshes