Recent horrifying news about devastating earthquakes, hurricanes, floods, wildfires, and tsunamis around the world had us wondering: How vulnerable are we here in the United States? Turns out it's pretty bad. We're not talking about a couple of feet of water in your basement or a tree down in the yard. We're talking about your home obliterated. And not just your home, but whole metropolitan areas. As This Old House found out, no matter where you live, you can't escape from the forces of nature. Read on to see how, in just the blink of an eye, entire American cities could be wiped off the face of the Earth.