From suburban towns and flat terrains to brutal rolling hills and city streets, the 26.2-mile Boston Marathon course is unlike any other.

Boston Marathon is expected to be a great day for runners and spectators based on the weather forecast. The weather changes every year, but the challenging 26.2 mile course does not. Here's a map of the route through eight communities from Hopkinton to Boylston Street in Boston.

The 129th Boston Marathon kicks off on the morning of Monday, April 21. And alongside the tens of thousands of runners and wheelchair racers, hundreds of thousands of spectators will line the 26.2-mile route and watch remotely to cheer them on.