The Seven Bridges of Königsberg

Seven Bridges of Königsberg

Long ago, in the city of Königsberg, there were seven bridges connecting two big islands and the riverbanks. The people in the town loved to walk. They wondered: 'Can we start walking from home, cross every single bridge exactly one time, and end up back where we started?' What do you think?

Is it possible to find a path that crosses every bridge exactly once?