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North-Western Italian architecture refers to architecture ( buildings , sights , monuments , churches , palaces ) in the North-Western regions of Italy ( Piedmont , Aosta Valley , Liguria and Lombardy ) , and their capital cities ( Aosta , Turin , Milan and Genoa ) .
 Piedmont, Aosta Valley, Liguria, Lombardy, Aosta, Turin, Milan, Genoa
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Piedmont, Aosta Valley, Liguria, Lombardy, Aosta, Turin, Milan, Genoa