2. Australian Outback Marathon, Australia
It is not every day that marathon runners get to take in such incredible sights as the world famous Uluru and Kata Tjuta. Running through desert landscapes, mammoth rock formations and deep red earth make this one unforgettable race. The course itself is fairly flat on roads and red sand trails, and the race is held in the middle of winter (July) to cut down on the extreme heat. Spend a little time in Yulara or Alice Springs before or after the event. Running 26.2 mile through the rugged outback in the red center of Australia is a huge achievement, and a challenge not to be missed.