It has different points of interest including the Golden Tree and the Fairies' Mirror in its valley, as well as Viviane’s house and Merlin’s seat on its ridges.

In Arthurian legend, the Val sans retour is an enchanted place created by King Arthur's fairy sister Morgan to imprison knights who are unfaithful to their ladies.

[1] In the Lancelot-Grail, a compilation of Arthurian texts from the thirteenth century, the Val sans retour is created by Morgan after a brief love affair with the knight Guiomar (also known as Guyamor, Guyomard, and other variants).

[3] Notable attempts to free the prisoners of the Val include the Duke of Clarence and the knight Yvain, Morgan's own son.

[1] Similarly to the story of the Val sans retour, the fate of Maboagrain represents a case where a woman reduces the freedom of movement of a knight.

[5] A parallel can be drawn with the Wife of Bath, who ultimately describes in the Canterbury Tales a female-dominated Arthurian kingdom, where the roles are reversed.

[6] According to the analysis of Carolyne Larrington, the Val, as Morgan's own creation, also reflects an important part of the personality of the fairy, in a sense a preemptive form of feminism.

As Morgan’s most spectacular and provocative magical display, the creation of the Val sans retour interferes in the lives of hundreds of Arthurian knights.

[7] It also illustrates the tension present in the relationship between men and women within the society of the time: in literary works, the knight is nothing without the love of a woman, often reduced to the role of an object.

Notably, they placed the "pavilion" of the fairy Morgan that the Lancelot-Graal located in the Valley of No Return in the Château de Comper.

By 1850, the location of the Val sans retour had been moved slightly to the west due to the establishment of a metallurgy building from the Paimpont forges, which distorted the legendary character of the Marette valley by contradicting the image of unspoiled nature.

[16] Appointed rector of Tréhorenteuc in 1942, Father Henri Gillard recognised the potential for the Christianisation of Arthurian legends to re-invigorate local faith.

[17][18] He personally funded a 12-year restoration of the church of Saint Onenne,[17] imbuing Arthurian legend into the traditional Christian decoration.

[18] The church became the meeting point for visitors wanting to learn about the legends of the Paimpont forest, rapidly increasing the number of tourists to the Val sans retour.

[9] With the abandonment of agricultural use of the site, brush clearing came to an end and, as a result, fires regularly ravaged the Val sans retour from 1959 to 1990.