A surprising new survey found that 57% of Americans don’t know where the Grand Canyon is. Here’s some other surprising facts, although 70% of Americans think they have a good knowledge of national landmarks 60% don’t know that Hoover Dam is between Nevada and Arizona, 37% didn’t know the Space Needle is in Seattle, 32% weren’t aware that Alcatraz is off the coast of San Francisco and what may be the most disturbing, 3% didn’t know the White House is in Washington D.C.