An interactive map of the Boston Marathon Route, with details about landmarks and transportation options along the 26.2 miles from Hopkinton to Copley Square.

April 21 is Patriot’s Day, a special holiday in Massachusetts that commemorates the state’s role in the American Revolution.

Here is an overview of the toughest miles of the Boston Marathon course, according to several past and present runners.

When runners arrive, they will run past the Johnny Kelley Statue. The statue is a tribute to the local legend who ran 61 marathons, the last of which came in 1992 when Johnny was 84. Near the race ...