U.S. Geography

Which of these became a U.S. monument in January 1908?

More Questions from U.S. Geography
Cincinnati is located on what major North American river?
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Which famous Alabama native founded the American Foundation for the Blind?
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In what state is Petersburg James A. Johnson Airport located?
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F. Scott Fitzgerald House is located where?
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What is the two letter abbreviation for the state of North Dakota?
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The name "Mississippi" is from an Indian word meaning what?
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Which US state is the smallest?
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In what state was the town of Hobbs End located in John Carpenter's film "In the Mouth of Madness"?
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