Thangka wall

A thangka wall is, in Tibetan religious architecture, a stone-built structure used for hanging giant, or monumental, appliqued thangkas, or scrolls, in some of the major Buddhist monasteries of Tibet. These giant thangkas are called "gos ku", "goku", "gheku", "kiku" (cloth image) in Tibetan. The thangka wall stands on a hillside from where it overlooks the monastic settlement. Its form is that of a narrow, elongated and tall rectangular building with a battered façade and a flat roof surrounded by a parapet.
Tibetan designations.
At Tashilhunpo monastery in Shigatse, the thangka wall has had the following designations:
At Palcho Chode monastery in Gyantse, the thangka wall is called
The words "kugo", "gos-sku", "goku", "gheku" and "kiku" refer to the monumental thangka ("kugo" being apparently the result of inverting the two syllables of "goku" while "gheku" and "kiku" are supposed to be informal pronunciations of "gos sku" or "goku").
Architectural designations.
In English-language writings, this type of building is referred to as "thangka wall" (Victor Chan, 1994; Andreas Gruschke, 2001; "The Tibet Album", 2006 ; Michael Henss, 2011 ; "Tibet", Lonely Planet, 2015 ; Diana Lange, 2016), or sometimes "support wall" ("Tibet", Lonely Planet, 2015) or "display wall" (Ronald M. Bernier, 1997).
American explorer F. Bailey Vanderhoef, Jr. uses the term "pylon" in his memoirs published in 1938.
In the original captions attached to the photos taken by the 1938–39 German expedition to Tibet, the Palcho Chode edifice is called 
"große Gebetsmauer" (large prayer wall) while its counterpart at Tashilhunpo is termed "große Tangamauer" (large thangka wall).
Inventory.
At least four large monasteries in China's Tibet Autonomous Region possess a giant thangka wall : Sera (Lhasa), Palcho Chode (Gyantse), Tashilhunpo (Shigatse) and Riwo Dechen (Qonggyai). The walls at Sera and Riwo Dechen are recent additions while those at Tashilhunpo and Palcho Chode are centuries-old monuments.
Sera (Lhasa).
The thangka wall at Sera stands near the Chöding hermitage (Tsongkhapa's retreat before the monastery was built). The wall is a recent replacement to a scaffolding erected on a slope. It has some semblance to its counterpart at Tashilhunpo (see beneath). The wall is used for lifting giant thangkas of the Buddha during the Shoton festival in August. The wide yard fronting the building is where the faithful gather to gaze on the giant thangkas.
Palcho Chode (Gyantse).
The massive, stark thangka wall at Palcho Chode towers above a hillside in the north-eastern part of the monastic enclosure built in 1425. The building of the wall is not supposed to have taken place before the 1430s when the associated monumental thangkas were commissioned.
During the Gyantse festival in the fourth month of the Tibetan year, the wall is used, within a two-year cycle, to display the Sakyamuni thangka in alternation with the Maitreya thangka. A third one, the Dīpankara thangka, is no longer displayed due to its poor state of repair. 
Tashilhunpo (Shigatse).
The Tashilhunpo thangka wall stands on a hillside in the north-eastern part of the monastic complex. Because of its overbearing position, it can be seen from afar. It is the largest and the most impressive thangka wall still extant. It is approximately 32 metres high by 42 metres long at the base. It was built in 1468
The wall is used for displaying giant representations of Maitreya (the Buddha of the future), Amitabha (the Buddha of the infinite light), and Sakyamuni (the enlightened Buddha) on the basis of one different thangka a day during the festival taking place on the 14th, 15th and 16th of the fifth Tibetan month (ie 1, 2 and 3 July).
Riwo Dechen (Qonggyai).
The kagyupa monastery in the possesses a thangka wall that overbears the other monastic buildings and can be seen from afar. It is a recently built addition to the complex. The front face of the building has a strong batter. A stone masonry retaining wall marks out the platform that extends outside the thangka wall.
A giant thangka of Maitreya, the Buddha of the future, is preserved and maintained by the monastery.
Mounting of the thangka.
A silk brocade is used to mount the thangka onto the wall. While mounting the thangka on the wall, it may alter some details on the iconography and overall aesthetic of the thangka. Hanging thangkas on damp thangka walls can also be detrimental to the condition of the thangka.