BOSTON (CBS) -- It will be a grand achievement for nine couples when they cross the finish line for the Boston Marathon on Monday. They will have completed the world's six major marathons as a group and will receive a medal that highlights each one of the races.

The other major marathons they ran are New York, Chicago, Tokyo, Berlin, and London.

One couple shared with WBZ-TV that they love the excitement in the city.

"We absolutely love Boston. We arrived yesterday, but it is already one of my favorite cities, and I just love how enthusiastic everyone is about the marathon," Beth Butler-Madden, who is from Wales.

On Monday, 450 of the runners will be competing their sixth major marathon.