The World Guide to Covered Bridges is a database produced by the National Center for Wood Transportation Structures at the Iowa State University Institute for Transportation. The database allows searching by bridge name, state, county, and the year the covered bridge was built. The results include if the bridge is private or if public access is allowed. A satellite view shows the location of the bridge on a map. Whether it is on the National Historic Landmarks list is also displayed, along with other field definitions.