 The National Blue Trail (simply Blue Trail, or Tour) was the first long distance walking route not only in Hungary but in the whole of Europe.Its path was first signed in 1938; its length was 910 km in that time.A lot of Hungarian hikers began the completion of the Trail after World War II, so the Nature Rambler Section of the Lokomotív Sport Club of Budapest announced the National walk on the "blue" hiking path in 1952.