''Heartbreak Hill,'' as it's appropriately been dubbed since Boston Globe reporter Jerry Nason coined the term in 1936, is the fourth and largest of the hills rising from the Newton portion of Boston's 26.2-mile marathon.
The hill spans the gap between miles 20 and 21, and is feared for its ability to suck the momentum out of even the most seasoned of runners.
That said, it's not all heartbreak and despair on the hill. There's also an unbelievable crowd offering up support to each and every racer, as fans from all over rallied to show their support.
There were chalk drawings, costumes and even choreographed dance routines, all designed to keep everyone motivated and running towards that finish line.
For more footage from "Heartbreak Hill," check out the video above.