While the scientific achievements of the Enlightenment had broadened human knowledge in the 1700s, it wasn't until the 1800s that those curious inventions paid off. The Industrial Revolution was born in western England's Severn River Valley, where the world's first cast-iron bridge was built in 1779, at Ironbridge Gorge. This bridge was just the beginning. In 1820, a trip from Paris to Vienna took weeks of hard travel on foot or by horse carriage; by 1850, you could board a train and be there the next day. Europe's world was suddenly smaller and faster.