One of the most important things about living in today''s modern world is the ability to travel. Bridges are one of the most important aspects of our modern transportation system. Since the beginning of civilizations, simple bridges have been used to get people over rivers, across valleys, and even across mountains. Today, technology allows engineers to design the most amazing architectural marvels in the world. This resource explores the fascinating history of bridge building and focuses on the engineering accomplishments that will allow safe and sustainable transportation today and far into the future.