5 Marathons in the Biggest US Cities
Philadelphia Marathon Where: Philadelphia, PA When: Sunday before Thanksgiving Approximate Finishers: 10,500 Register: philadelphiamarathon.com Houston Marathon Where: Houston, TX When: Third Sunday in January Approximate Finishers: 7,000 Register: chevronhoustonmarathon.com Chicago Marathon Where: Chicago, IL When: Second Sunday in October Approximate…