A sacred site need not perch upon the highest peak, nor reside in some famous great monastery.

Sometimes, a city itself is a sacred site.

Lo Manthang is such a city. Its walls stand no more than six meters high, and the city spans just over a square li, yet for six hundred years it has held an entire Sakya lineage whole within its embrace. Temples stand inside the city, and the temples are the city; the inhabitants dwell beside the temple walls, and the morning chanting is their dawn bell.

The oldest temple in the city is Jampa Lhakhang, said to have been built in 1447, enshrining Maitreya.

The hall has no windows; only butter lamps burn continuously. In their glow, a giant Maitreya statue rises through three floors of the hall, eyes lowered in compassion, gazing down upon all who come. Looking up and around, the walls are covered entirely with gold-ground mandalas — artists ground real gold into liquid and, upon the deep-colored ground, painted out the mandalas, the principal deities, and the protectors layer upon layer. Hundreds of mandalas join into one expanse, which researchers call among the most exquisite mandala-mural ensembles of the Himalayan region.

The lamp is an offering; the mural is a practice. In this hall that admits almost no daylight, the devotee boils his intent into the lamp oil, and the painter grinds his devotion into the gold ink — two things passed down through the generations.

In the latter half of the fifteenth century, the Kingdom of Lo was at its height.

In 1472, a great assembly hall rose within the city — this is Thubchen Gompa. It is grander than Jampa Lhakhang: massive wooden pillars uphold its lofty hall, where hundreds of monks can gather at once. Its fifteenth-century murals were painted with lapis lazuli, turquoise, and cinnabar — blues serene, greens deep, reds ardent. Centuries on, the colors remain vivid.

This "non-fading" is owed to the dryness of the land. Mustang lies in a rain shadow, with no more than three hundred millimeters of rain a year. Moisture does not intrude, pigments do not spoil, and so the colors of the fifteenth century have been preserved intact into the twenty-first.

If Jampa Lhakhang is the beginning of the ancient city's heart, then Chode Gompa is the heart itself, beating for six hundred years.

It is the center of Lo Manthang's religious life, with a Sakya monastic school attached. At dawn, young monks hold their scriptures and recite in the porch before the hall; at dusk, the sound of circumambulation rises beneath the white chörten. The city's festivals, ceremonies, and ordinations are all presided over by Chode Gompa. Every year, at the Tiji Festival in the third lunar month (around May by the Gregorian calendar), it is Chode Gompa that leads — monks don masks centuries old and perform the demon-subduing dance in the city center, staging that "victory of good over evil" performed for six hundred years.

If a ritual object is a scripture enshrined, then a mural is a scripture painted upon the wall.

The murals of Jampa Lhakhang are the most precious thing in the whole city. Hundreds of mandalas spread across the walls upon a gold ground — the central mandala, the principal deities at the four corners, the protectors at the edges, layered one upon another with almost no space left. The artists ground real gold to powder, mixed it with glue into liquid, and traced with the finest brush upon the dark ground — between the light and dark of the gold ink, the轮廓 of the Buddha's form and the pattern of the robe gained their light. Judging by style, researchers infer that these murals came from the hands of painters of the fifteenth-century Tibet-Nepal border, in the same lineage as the contemporary murals of Sakya Monastery and Ngor Monastery.

The murals of Thubchen Gompa have another spirit entirely. Here the pigments are mainly mineral — blue from ground lapis, green from ground turquoise, red from ground cinnabar — covering whole walls. The craftsmen used local materials, dissolving the minerals of the high mountains into the painting, then, by the dryness of the rain shadow, let these colors endure six hundred years without decline. Upon the great wooden pillars of the hall are also painted coiling dragons and flying apsaras — a rare secular ornament in Mustang.

The giant Maitreya image is yet another awe. The Maitreya of Jampa Lhakhang rises through three floors; looking up from the lowest level, one must crane the neck fully to see its compassionate face. The image is modeled in clay and painted in color; the robe folds follow the body, and its lowered gaze seems to watch each upturned face. A butter lamp is kept burning before the image year-round, its glow trembling gently upon the painted folds — in this windowless hall, the lamplight is sun and moon.

Such murals and images were made for worship, yet inadvertently became unique survivors of Himalayan art. They await no guest's admiration, only the lamp's light; and this, precisely, is why they have remained intact for centuries.

The boundary of the sacred site does not end at the city wall.

To the southeast, northwest, and every direction beyond the walls stand white chörtens (Chörten). New and old alike, they line the ridges in a row — prayers of the faithful for the next life, and coordinates for the traveler's homeward path. Farther off, the ruins of ancient fortresses stand solitary upon the hillsides — the older memory of the Kingdom of Lo, even more ancient than Jampa Lhakhang. New stupas beside old fortresses, prayers pressing upon wars — precisely the complete metaphor of this city.

Jampa, Thubchen, and Chode — three temples of different eras, yet all enshrining the same lineage: Sakya.

In the fifteenth century, Ngorchen Kunga Zangpo, the founding master of the Ngor branch of Sakya, entered Lo three times, established the lineage in Lo Manthang, and oversaw the transcription of the gold-ink Kanjur. From then on, the rituals, monastic codes, and offerings of the three temples all took Sakya as their orthodoxy. The royal city supported the temples, and the temples protected the royal city; the relay of state and religion ran smoothly across this plateau for six hundred years.

It was not until 1992 that Upper Mustang was opened. When the first travelers poured in beyond the walls, the three ancient temples still ran by their own rhythm — the dawn bell sounded as before, the lamp oil was replenished as before, and the lapis on the murals still glowed its serene blue.

In Lo Manthang, faith is not a ritual but a schedule.

Before dawn, the chanting of Chode Gompa spills out from the main hall. The faithful rise one by one, first press their palms together beneath the prayer flags on their own rooftops, then walk clockwise, circumambulating the ring of white chörtens outside the city wall. The prayer beads pass through the fingers one by one, and the Six-syllable Mantra rises and falls with each step. Some turn once, some seven times, some for a whole day.

At noon, the sun scorches the earthen walls hot. Pilgrims gather mostly in the porch before the temple — some add oil to the butter lamps, some mold tsampa flour into torma (offering cakes), some ask a monk to recite a blessing sutra. The town's merchants, herders, women, and children each find their place within this daily rhythm.

At dusk, those circumambulating grow in number again. The shadow of the white chörten is drawn long, straight to the foot of the wall. In the distance, a herder's yaks return from the pass, their bells mingling with the chanting into one in the twilight. At nightfall the city gate closes, butter lamps light before each household shrine, and the whole city sinks to sleep in warm yellow light.

So it is day after day, year after year. For six hundred years, the walls of Lo Manthang have changed their skin and the gates their hinges, yet this cyclical devotion has never broken for a single day.

When a leap month comes, the circumambulation path outside the walls gains crowds of additional figures — people believe that circumambulating in a leap year multiplies the merit. And so for those few days the butter lamps burn brighter than usual, and the chanting in the city grows more sustained.

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• Images: Glama1 (CC BY-SA 4.0); Jean-Marie Hullot (CC BY 2.0, two photographs); Gerd Eichmann (CC BY-SA 4.0)
• Video: NEPAL: The Last Forbidden Kingdom on Earth | 8K Travel Documentary · True Planet Explorer / YouTube

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