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The Seven Bridges of Konigsberg

In Konigsberg, Germany, a river ran through the city such that in its center was an island,
and after passing the island, the river broke into two parts.
Seven bridges were built so that the people of the city could get from one part to another.
Can you you cross all seven bridges only once?
Sketch the above map of the city on a sheet of paper
and try to 'plan your journey' with a pencil in such a way
that you trace over each bridge once and only once
and you complete the 'plan' with one continuous pencil stroke.

This is impossible to do.