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Among his most famous landmarks are the Oliver G. Traphagen House in Duluth , called the Redstone , and the Moana Hotel in Honolulu , both of which are on the National Register of Historic Places , as are several other buildings he designed .
 Oliver G. Traphagen, Duluth, Honolulu, National Register of Historic Places
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Oliver G. Traphagen, Duluth, Honolulu, National Register of Historic Places