U.S. Geography

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

More Questions from U.S. Geography
Where is America's "official" Christmas tree?
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Which state is called the "Valentine State"?
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Which state is known as the "Land of Enchantment"?
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The state of Wisconsin is located in which region of the U.S.?
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Which U.S. state was named for William Penn?
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In which one of the following states is the town of Noel located?
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What river in Mississippi flows in and out of the popular fishing attraction, Sardis Lake?
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Which is the capital of the U.S. state of Oregon?
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