By Tracy Zwick

First run in 1970 as four laps in Central Park with 55 finishers, the NYC Marathon left the park and entered the five boroughs in 1976.

It’s never looked back.

This Sunday, for its 56th iteration, the TCS NYC Marathon will include more than 55,000 participants and over two million spectators on the best day of the year in New York City. And its home base and finish line are in the best part of town: the Upper West Side.

The race is organized by the nonprofit New York Road Runners organization, and it starts Sunday morning at 8:00 a.m., but festivities begin before then. Here is an itinerary and other information about watching the race:

NYC Marathon Expo : One of the country’s largest running expos, it’s free and open to the public at the Jacob K.Javits Center

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