According to a new survey conducted by 60 Minutes/Vanity Fair, the least impressive U. S. landmark is the Gateway Arch in St. Louis.  The rest of the bottom five are the Alamo, Mount Rushmore, the Grand Canyon and Niagara Falls.  There seems to be a flaw in the survey.

Those were the only choices given to respondents.  Plenty of potential landmarks got left out.  My examples would include the Hollywood Sign, The Liberty Bell, and any Civil War battlefield my father enlightened my existence with as a kid.  I'm willing to bet you could come up with a few that are lackluster as well.

What do you think?  What is the least impressive U.S. landmark you've visited?