A note on scope
This article covers what happened to Borobudur after its active period: the long silence, the 19th century rediscovery and the restorations that gave the monument its present shape. Who built it and when is the subject of the article on the Sailendra dynasty, and the meaning of its design is covered separately. Here the focus is on what is known, what is only suggested and what is simply lost.
Abandonment
There is no firm record of when Borobudur stopped being used for worship, or why. Several explanations are discussed. One is that political and economic weight moved from central Java toward the east of the island around the 10th century. Another is that volcanic eruptions in the region disrupted settlement; this is plausible in a landscape with active volcanoes, but it is hard to prove for this particular site. Gradual changes in religion and patronage across Java probably also played a part. Most historians prefer to describe a slow decline rather than a single event.
What is clear is that, by the time Europeans wrote about it, the monument was partly buried under soil and vegetation and was remembered locally as a hill or mound with ruins. Local memory of the site never entirely vanished, although the Buddhist context in which it had been built was largely forgotten.
Rediscovery in the 19th century
In the early 19th century, the island was under a brief period of British administration. The lieutenant governor, Thomas Stamford Raffles, heard reports of a large monument in the interior and ordered a survey and a clearing of the site, which was carried out under a Dutch engineer in 1814. Raffles later included the monument in his published history of Java, and from then on it was known to the wider world. The pattern is similar to other cases of archaeological rediscovery in Asia, such as Sarnath rediscovery, where 19th century surveys brought a forgotten Buddhist site back into view.
After Java returned to Dutch control, further clearing and recording took place through the century. Scholars made drawings and later published studies of the reliefs, and in the 1880s the buried lower base was found and then examined, an event discussed in the article on the Borobudur reliefs. Photography in the 1890s created a visual record of that level before it was covered again.
This period also had a darker side. Visitors and officials removed carvings, statues and stones as souvenirs or gifts, and the monument suffered from neglect, plant growth and water. Some pieces ended up in collections outside Indonesia.
The first restoration
A first major restoration was carried out in the early 20th century, from roughly 1907 to 1911, under a Dutch army officer and engineer named Theodoor van Erp. It straightened and repaired parts of the structure and rebuilt some of the upper terraces. The work was important but limited by the methods of the time. Rainwater continued to seep into the core, and over the following decades the monument’s stability again became a concern.
The UNESCO era
By the mid 20th century, drainage problems and shifting of the hill beneath the monument were widely recognised, and the Indonesian government made an international appeal for help. A large restoration followed, running through the 1970s and into the early 1980s, with UNESCO coordinating international assistance. In outline, the work involved:
- taking down a large part of the upper structure stone by stone;
- strengthening the base and adding drainage and filtering layers;
- cleaning and replacing the stones in their original positions where this could be done;
- and replacing missing stones with new ones, usually kept distinguishable from the old.
Exact quantities of stone, workers and cost are quoted in many places but vary by source, so they are left out here. The project was completed in the early 1980s, and the monument was formally reopened in 1983. It was inscribed on the UNESCO World Heritage List in 1991.
Later events
Borobudur has not been free of difficulties since. A series of bombs damaged several stupas in 1985; they were later repaired. Volcanic ash from nearby Mount Merapi fell on the monument during eruptions in the 21st century, and teams have carried out cleaning and conservation afterward. Today, wear from visitors’ feet is a recurring concern, which is why stairway access and footwear rules have been changed in recent years. For the practical side, see the visitor article and check current official rules.
What the restoration debate shows
Large restoration projects raise a familiar question: how much should be rebuilt? Borobudur is often cited as a successful rescue, but conservation specialists also discuss the limits of anastylosis, which means reassembling a monument from its original stones. A repaired monument is partly a modern reconstruction. Responsible heritage tourism recognises this, and so does the case of Angkor archaeological park, where similar choices have been made. The loss of the Bamiyan Buddhas in Afghanistan in 2001 is a reminder of how fragile such heritage can be.
What remains uncertain
Several points are still debated: the exact cause and date of abandonment, the original appearance of parts of the upper structure and the full extent of what was removed during the colonial period. A cautious reading prefers to say that these questions remain open. The established points are the survey in the early 19th century, the first restoration in the early 20th and the UNESCO-supported project that ended in the early 1980s.