Experts investigate a deadly hotel walkway collapse in Kansas City. Watch as we uncover engineering catastrophes from the Texas Sinkhole, Missouri Skywalk Disaster, to the UK Building Collapse and Iowa Highway Project. What caused one of the deadliest disasters in US history to devastate a Kansas City hotel? In Texas, a suburban road collapses without warning. In the UK, why did a pioneering construction project start to sink? And a major safety project in Iowa grinds to a halt.