U.S. Geography

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

More Questions from U.S. Geography
Which state's motto is "You've got a friend in _"?
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Which of these is the longest river in the United States?
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Which city in Rhode Island is the second most populated?
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Which of these is the tallest mountain in the United States?
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What ocean borders Kansas?
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Which state is known as "The Old Line State"?
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What Massachusetts city was America's first planned industrial city?
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With a land area of 9,249 square miles, where does Vermont rank among the 50 states?
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