Dunhuang and the Mogao Caves

Dunhuang sits at the precise point where the Silk Road's northern and southern branches diverge around the Taklamakan Desert. For a caravan moving east, it was the last major oasis before the long desert crossing; for one moving west, the first. That position made Dunhuang, for roughly a millennium, one of the most important waypoints on the entire Silk Road — a place where merchants rested, where Buddhism passed from Central Asia into China, and where the accumulated wealth of a trade route was channelled, over generations, into the greatest surviving body of Buddhist art in existence.

The Mogao Caves — a cliff face of hand-carved grottoes in the desert thirty kilometres south of Dunhuang town — contain nearly 500 painted caves dating from the 4th to the 14th century, with a million square feet of surviving fresco and thousands of polychrome sculptures. They are the physical record of the Silk Road's deepest traffic: not silk or paper or horses, but the slow westward movement of a faith that would reshape Chinese civilisation. The story of one sealed chamber found in 1900, and the manuscripts it held, has become one of the most remarkable episodes in the history of archaeology.

The city at the desert's edge

Dunhuang itself is a small Chinese oasis city surrounded by desert, its modern centre busy with tourism infrastructure for the caves, its older margins fringed by the sand dunes of the Mingsha Shan — the Singing Sands mountains, where the dunes, shaped by crosswinds, emit a low resonant hum on calm evenings. The Crescent Lake, a spring-fed pool at the dunes' foot, has persisted for centuries in the middle of the desert, its level barely changing even as the surrounding sand shifts season by season.

The oasis sustained a population large enough to support a sophisticated artistic culture precisely because of its position on the Silk Road. Trade generated surplus; surplus, in the Buddhist framework that took hold here from the 4th century onward, was channelled into acts of religious patronage. Carving a cave, filling it with paintings, commissioning a sculpture: these were acts of accumulated merit, a form of prayer expressed in pigment and stone, and they continued for ten unbroken centuries.

A thousand years of painting

The caves at Mogao were begun around 366 CE by a Buddhist monk named Yuezun, who, according to tradition, saw a vision of a thousand Buddhas in the light of the setting sun and began carving in the rock. The site grew across the Northern Liang, Wei, Sui, Tang, Five Dynasties, Song, Western Xia and Yuan periods, each dynasty adding its own aesthetic and iconographic preferences to the accumulating chambers. The Tang dynasty, from the 7th to the 10th centuries, was the period of the greatest activity and the most ambitious scale.

The imagery is encyclopaedic. There are colossal Buddhas, some reaching 34 metres in height. There are ceiling canopies of lotus flowers and flying apsaras rendered in lapis and malachite. There are narrative scenes from the Jataka tales — the stories of the Buddha's past lives — dense with domestic detail: cooking pots, textiles, musical instruments, the recorded furniture of Silk Road daily life. And there are the donor portraits, the merchants and officials who paid for the caves, depicted at the margins in the clothes and faces of their own time, looking sideways into history.

The sealed library: Cave 17

In 1900 a Taoist monk named Wang Yuanlu, who had made himself the unofficial guardian of the site, was clearing sand from one of the painted corridors when he discovered a sealed side chamber. When he broke through, he found a space roughly 2.7 metres square stacked floor to ceiling with manuscripts, paintings on silk and hemp, embroideries and printed documents — approximately 40,000 items in all, sealed behind the plastered wall perhaps in the early 11th century as a Tangut invasion threatened.

The cache is now known as Cave 17 or the Library Cave. The manuscripts, written in Chinese, Tibetan, Sanskrit, Sogdian, Uyghur, Syriac and at least a dozen other languages and scripts, document the religious, administrative and commercial life of the Silk Road world over several centuries. Among them was the Diamond Sutra, printed in 868 CE — the world's oldest dated printed book. Between 1905 and 1910, explorers including Aurel Stein and Paul Pelliot acquired the majority of the collection, which is now divided between the British Library, the Bibliothèque nationale de France and the National Library of China. The ethics of those acquisitions remain contested.

Buddhism's passage through Dunhuang

The caves are inseparable from the history of Buddhism's movement into China. The religion entered along the Silk Road from India through the Central Asian oases, and Dunhuang was the last major waypoint before the Chinese interior. The paintings record that passage with exceptional clarity: early caves show stylistic elements from Gandhara and Central Asia blending with Chinese visual conventions; later Tang caves are wholly Chinese in style but still show Central Asian musicians, merchants and monks in their narrative margins.

The monk Xuanzang, who made his famous journey from Chang'an to India and back in the 7th century — the journey whose scriptures were eventually housed in Xi'an's Giant Wild Goose Pagoda — passed through Dunhuang twice, and his route is documented in the cave paintings. The caves are not merely art; they are a record of the intellectual and spiritual exchange that was the Silk Road's most consequential cargo.

Visiting the caves today

Access to the Mogao Caves is now carefully managed by the Dunhuang Research Academy, which has administered the site since 1944 and is responsible for some of the most advanced conservation work on any historic site in China. Visitor numbers are limited, and the humidity that human breath introduces into the caves — the primary threat to the pigments — is managed by rotating which caves are open on any given day.

The standard visit opens approximately ten caves, changing seasonally; a small number of additional caves with exceptional paintings are accessible by special permit for a small group visit. A large new visitor centre at the site contains high-quality digital reproductions of caves not normally open, and is worth time before or after entering the site itself. Dunhuang is reached by direct flights from Xi'an, Beijing and several other Chinese cities, or by train to the nearby station at Liuyuan.