What monument in the West region of the United States is the world's tallest monumental column?

Answer Washington Monument

The Washington Monument is the world's tallest monumental column when measured above its pedestrian entrance. It was the world's highest structure from 1884 until 1889 when it was surpassed by the Eiffel Tower. The monument was designed by Robert Mills, who allegedly was the first native-born American to get professional architectural training.

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