The Boston Marathon is an iconic annual marathon hosted by several cities in greater Boston in eastern Massachusetts, United States. It is the world's oldest annual marathon, having been established in 1897. Held on Patriots' Day, the third Monday of April, it attracts over 30,000 runners from around the world, ranging from elite to amateur athletes. The course runs from Hopkinton in southern Middlesex County to Copley Square in Boston. Known for its challenging route, particularly the Heartbreak Hill, the marathon is a prestigious event that embodies the spirit of endurance, community, and international camaraderie in the world of long-distance running.