From the English Wikipedia page [1] - with the poem being given on the German Wikipedia page [2].
The Fenn treasure is a treasure supposedly worth between $1-3m hidden by writer Forrest Fenn in the Rocky Mountains. As of 20 August 2016, the treasure is still unfound.
During a period of illness in 1986, Fenn filled a lockbox with "treasure" containing gold nuggets, rare coins, jewelry and gemstones. He intended to hide it and die in the wilderness, with the treasure as a legacy. However, he survived his illness and then decided to recreate the treasure and hide it in 2009 or 2010. He will not specify which year.
In March 2013, he revealed that the treasure is hidden more than 5,000 feet (1,500 m) above sea-level.
Many people have made attempts to find the location which can be anywhere in the Rocky Mountains North of Santa Fe. In March 2013, a woman attempted to unriddle the poem to find the location of the box, but failed and spent the night lost and exposed, near Ancho Canyon Trail in Bandelier National Monument. She was later found alive.
On May 3, 2013, Fenn was interviewed to reveal "The treasure is not in a graveyard." This was in response to an arrest of a treasure seeker the previous month. His memoir "The Thrill of the Chase" (ISBN 9780967091785) was published in 2010, containing a poem that contains clues to the location of the treasure.
In September 2013, Fenn announced the publication of a new book, Too Far to Walk, containing a pullout map of the area surrounding the treasure.
There are many webpages discussing the subject, including [3] and [http://fennboree.org/.
See also Kit Williams and Puzzlehunt