U.S. Geography

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

More Questions from U.S. Geography
Which Florida "fort" was active during both World Wars, the Civil War and the Spanish-American War?
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In what state will you find the headwaters of the Missouri River?
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Which U.S. state touches only one other state?
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Which two European countries both claimed the Ohio Territory as theirs?
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In what county did the infamous "Bloody Vendetta" take place?
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What city is located near the highest point in Mississippi, also the site of a Civil War engagement?
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What is the state capital of Idaho?
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Delaware State University is located?
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