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