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The plan calls for the canisters to be taken to a vapor - tight building that would have to be constructed at the 27 - square - mile arsenal northeast of Denver .
 Denver, a vapor - tight building that would have to be constructed at the 27 - square - mile arsenal northeast of Denver, that, the 27 - square - mile arsenal northeast of Denver, the canisters
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 Denver, a vapor - tight building that would have to be constructed at the 27 - square - mile arsenal northeast of Denver, that, the 27 - square - mile arsenal northeast of Denver, the canisters