CHICAGO (WLS) -- Tens of thousands of runners stepped off for the 47th Bank of America Chicago Marathon on Sunday morning.

More than 50,000 athletes from all 50 states and 100 countries are taking a 26.2-mile tour of Chicago.

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It all started in Grant Park, right by the Art Institute.

Runners will spend time in 29 of Chicago's vibrant neighborhoods with at least 1 million people expected to line the race route.

Many of Sunday's runners are also running for a good cause. Millions of dollars are raised each year for dozens of different nonprofits while nearly $700 million is raised for the race's host city.

The Bank of American Chicago Marathon officially stepped off at 7:30 a.m.

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