hysteria rain supreme. everyone needs to be calm about the situation and . reporter: the park service closed the monument and faced off a 150-foot perimeter. and going to the top is a rite of passage for tourists, they left disappointed. just seemed and that i would have, i wouldn t want my kids going in there with a crack and taking chances. reporter: structural engineers must examine the washington landmark to figure out what to do next. the monument that we re confident will, in due time, we will be able to open it. reporter: he can t say when. the andersons were relieved to learn it was an earthquake and not a terrorist act take. the 12-year-old emma worried it was going to cave in. was coloring myself and i was like what is happening and went running down the stairs. reporter: thankful they survived. my sister has a bruise and scratches. we had debris in our hair. reporter: and they kept their tickets. we ll save them as a memento and definitely an