In this lesson, students explore arch bridges—one of the earliest bridge designs—and because of its beauty and strength, a design that has stood the test of time. Through experimentation, students investigate strength, span length, and overall structure of arch bridges. Using this information, they investigate possible construction sites and determine whether an arch bridge would be an appropriate bridge design for that location. Finally, students explore what role arches have played in the development of infrastructure throughout history. We recommend reading Chapter 3, which is included in this book selection and provides a module overview and summary. A materials list, safety notes, standards, assessment, teacher background information, Internet resources, and references are provided. This book selection also includes the Table of Contents, About the Editors and Authors, Acknowledgments, Appendix, and Index.