Not only is travelling by train a more relaxing and scenic alternative to flying, it's also significantly more eco-friendly. A global study by the International Energy Agency (IEA) found that rail travel emits up to 90% less carbon dioxide per passenger compared to air travel. From iconic experiences like riding Japan's bullet trains to the TGV's swift services across France, here are some of the finest high-speed routes to inspire your next adventure.

Click through this gallery to discover the best high-speed trains that make flying redundant...