Do you want to go from Madison, WI, USA to Milano? Why don't you have a swim across the Ocean?
Sounds silly? Well, these are the directions that Google Map is suggestions to go from any place in the US to any place in Europe. And they also estimate that you are going to take 30 days to swim the 3500 miles from Long Wharf NY, to Le Havre. This means that you have to swim without rest for 30 days at around 7,8 km/h (which is the same speed of the 100m swimming male Olympic record)
Below is a screenshot, and the link to my trip from Madison, WI, USA to Milano.