U.S. Geography

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

More Questions from U.S. Geography
What city or place is Andrew Carnegie Mansion in?
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Where were Jacqueline Bouvier Kennedy and John F. Kennedy married?
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Which of these rivers is located in the U.S.?
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What bridge connects Washington, D.C. to Arlington National Cemetery?
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Which Prohibition Amendment to the Constitution was never ratified in Connecticut?
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In which U.S. state includes the cities of Jacksonville, Miami, Tampa, and Saint Petersburg?
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What hit animated TV series is base in a fictional town in Rhode Island?
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Which President had a monument erected in a single day in 1827 on a hillside in Boonsboro, Maryland?
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