The bridges of Königsberg problem

During the 18th century there was in Königsberg (city located in Prusia, nowadays Kaliningrado, Russi) seven bridges that connected each of the shores of the Pregel river with two inside islands.

Citizens were very proud of their bridges and joked about the posibility of walking all crossing just once each one of them.

Is that possible?

Have a look at that picture for some help:

Once you tried to solve it check out your answer by clicking this link:
Solution