A very interesting and long-term project is the Mattigtal Hedge Labyrinth of Human Rights by Norbert Knoll from Vienna.
He is writing about that as follows:
Plantation of the biggest Austrian hedge labyrinth up to now in October, 2010 to a great extent concluded
About 50 km to the north of Salzburg (Austria), in the Innviertel municipality of Helpfau-Uttendorf the Mattigtal Hedge Labyrinth of Human Rights (MHM) should originate. After the concept which was developed already in 2003, the plantation of a meadow with scattered fruit trees in 2005, and first hedge rings in 2008, a substantial progress followed in October, 2010. In 2012 the still outstanding works should be completed.
With a diameter of 64 m, a hedge length of about 1000 m, a path length to the centre of 760 m, covering a surface of about 2900 square metres, a labyrinth will be created which distinguishes itself not only by its size, but also by some specific features in the design. Along the 2-m-wide path to the middle four resting places are located; trees are inserted in the hornbeam hedge and the centre is laid out very generously with a diameter more than 20 m; it should later get a sculpture and offer enough place for events and activities of bigger groups.
Within the scope of the action “72 hours without compromise” of the Catholic Youth Austria there was in October, 2010 a substantial step in the building progress. An article (in German) about this action you may find on the website 72h.at.
During the next years even other plantations are planned and not later than 2014 as crowning end a sculpture by Stefan Esterbauer should be put up in the centre, the ribbon of brotherhood to the memory of the Universal Declaration of Human Rights by the UN in 1948.
Here is the draft with the plantation plan and the sculpture:
The long-standing works have left traces which have been discovered by Google Earth.
Here the interactive map: