The idea was born after having run Chicago a few times, qualifying for Boston and winning a New York lottery entry. With friends to visit in New York, London and Berlin, it became feasible.
It's been a great experience to run these famous courses in front of large crowds. Conditions ranged from cold, windy and rainy in Boston to way too hot in Chicago, had mixed conditions including a solid rain shower in London and were just perfect in both New York and Berlin. The crowds were awesome in all five places. All in all, these races were a blast -- if you're into long-distance running, give each or all of them a shot.