Here is a photo of CJ Hill on the steps of the Jefferson Memorial. The first scene of Slayers happens at the Jefferson Memorial, and after she sent it to her editor, she started to worry that a dragon actually could make his way through the columns. If this were the case, said dragon would munch on tourists, thus drastically changing how the prologue should have turned out.
CJ was so afraid of being mocked by thousands of Jefferson Memorial aficionados for not knowing how far the columns are away from each other, that on a recent trip she visited the memorial. As any dutiful author would, she stepped out the area between the columns to see if a dragon could squeeze through them. (And no, the scads of tourists around her didn't think she was odd for doing this.)
CJ is happy to report that the Jefferson Memorial is indeed dragon proof, which means you can all carry on, cavorting at the memorial without fear.
Unless of course, you take baby dragons into consideration. They're smaller but just as vicious.