Starting in the early 1800s, Pennsylvania's rich forests provided natural material for the construction of more than 1,500 covered bridges across the state. The first covered bridge was built in 1805. Pennsylvania's Covered Bridges looks at the earliest covered bridges as well as those that have survived modern progress. Images also show rare railroad covered bridges that have been saved from destruction over the years. This book invites the reader to step back in time and imagine the days when ancestors traveled through wooden spans to reach their daily destinations.