Run the race where it all started: The trek begins on an ancient battlefield in the town of Marathon. This course is challenging, as it begins near the Aegean Sea and climbs up towards Athens, about 360 feet above sea level. But we think running a legendary route that’s more than 2,500 years old makes up for any uphill discomfort, especially when you reach the finish line at Panathinaiko Stadium where the first modern Olympic Games were held in 1896.