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The city layout changed after 1870 , when the seaside fortifications gave way to extensive piers , and many of the oldest walls of the city were demolished , including those surrounding the White Tower , which today stands as the main landmark of the city .
 White Tower
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 White Tower