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The Gateway Arch and its immediate surroundings were initially designated as a national memorial by executive order on December 21 , 1935 , and redesignated as a national park in 2018 .
 Gateway Arch
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:
 Gateway Arch