Extras

    Video thumbnail: 10 That Changed America Web Extra: The Current State of the Interstate

    10 That Changed America

    Web Extra: The Current State of the Interstate

    The once futuristic Interstate Highway System is now in need of repair.

    Web Extra: The Current State of the Interstate

    Video thumbnail: 10 That Changed America Web Extra: When Mules Ruled the Canal

    10 That Changed America

    Web Extra: When Mules Ruled the Canal

    The role played by mules that pulled barges along the Erie Canal in its early days.

    Web Extra: When Mules Ruled the Canal

    Video thumbnail: 10 That Changed America Web Extra: A Modern Ride on the Transcontinental Railroad

    10 That Changed America

    Web Extra: A Modern Ride on the Transcontinental Railroad

    Amtrak still operates trains over portions of the original Transcontinental Railroad.

    Web Extra: A Modern Ride on the Transcontinental Railroad

    Video thumbnail: 10 That Changed America Web Extra: A View from the Top of the Roebling Bridge

    10 That Changed America

    Web Extra: A View from the Top of the Roebling Bridge

    Geoffrey goes to the top of the Roebling Bridge to learn about its engineering feats.

    Web Extra: A View from the Top of the Roebling Bridge