Held in April, this 50km ultramarathon will take you to the lowest point on earth, 418 meters below sea level. Yes, this means it's all downhill. But don't let that fool you—the downward route can be brutal on the legs if you haven't trained properly. The small number of participants leaves the desert path almost empty, aside from some camel bystanders. When you reach the finish line at Amman Beach be sure to celebrate your accomplishment with a dip in the Dead Sea.