Even as a startup race way back in 1976, the Marine Corps Marathon was an instant hit — and has only continued to grow and expand in popularity a half-century later.
In that initial year the race attracted a bit more than 1,100 runners, an impressive number for an upstart event. Today the participation total has swelled to between 35,000 to 40,000 each year, making it the third largest marathon in the U.S., and the largest race in the world that does not offer prize money.