This is odd. I’d assume it’s some sort of clever Google Easter egg instead of an actual error, but it’s funny nonetheless.
If you use Google Maps to find driving directions from Standford, California, to Stockholm, Sweden, you’ll find some very interesting results. It starts off pretty normal, jump on I-80 and drive a couple thousand miles. Things get interesting when you hit the Atlantic, however, and Google tells you to get out of your car and swim across the Atlantic Ocean for 3,500 miles.
I hope you brought your swimsuit.
Update: This works with any U.S. city, if directions are requested to a city across the pond. For instance, Paris, TX to Paris, France.