National Park Service, Wyoming.
It is hard to believe that young men once rode horses to carry mail from Missouri to California in the unprecedented time of only 10 days. This relay system along the Pony Express National Historic Trail in eight states was the most direct and practical means of east-west communications before the telegraph.
You can visit many sites of the Pony Express National Historic Trail over the 1,800-mile historic route that crosses 8 states.