When it comes to national landmarks, St. Louis' Gateway Arch fails to impress.  Forty-six percent of people polled by "60 Minutes" and "Vanity Fair" say the arch is the least impressive national landmark.  The Alamo in San Antonio is second on the list, with 31-percent of respondents saying it's the least impressive landmark in America.  

Mount Rushmore and the Grand Canyon are tied for third at six percent, and Niagara Falls rounds out the dubious top five with three percent.

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