we used to have many landscapes like this on the danube.g greatly changed by the construction of power plants. -- they have all been greatly changed by the construction of power plants. this is the last one in its natural state. >> we want to communicate this to the other people. this is the example of it. >> he posts impressions of his journey on the internet so that as many people as possible cancer in his wonderful experiences. ♪ there is nothing have so much worth doing as simply messing about in boats. i hope he agrees with him after six months at the oars. goodbye. ♪ captioned by the nationap