If there's one thing you can count on seeing (and smelling) in Hopkinton on race day, it's the ubiquitous Porta-Potty. Despite the legions of toilets, sanitation is a concern with over 20,000 runners. It's not uncommon for residents to find racers taking pitstops on their front lawns. (Ian Gray)

Big Marathon in a Small Town

If there's one thing you can count on seeing (and smelling) in Hopkinton on race day, it's the ubiquitous Porta-Potty. Despite the legions of toilets, sanitation is a concern with over 20,000 runners. It's not uncommon for residents to find racers taking pitstops on their front lawns.

Credit: Ian Gray