U.S. Geography

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

More Questions from U.S. Geography
In which state can you find 'Death Valley'?
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Which Washington state volcano erupted in 1980?
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What are the names of the two major daily newspapers in Boston, MA?
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Which 1807 act did Vermont oppose because it disrupted the state's trade with Canada?
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In which two years did Los Angeles host the Olympics?
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What was the name of the New Mexico bear cub that became the National Fire Safety symbol?
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What Iowa monument is named for the only person known to die on the Lewis and Clark expedition?
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Which of these is one of Utah's national monuments?
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