The glorious ninth-century Buddhist stupa of Borobudur--the largest Buddhist monument in the world--stands in the midst of the lush Kedu Plain of Central Java in Indonesia, where it is visited annually by over a million people.

Borobudur contains more than a thousand exquisitely carved relief panels extending along its many terraces for a total distance of more than a kilometer. These are arranged so as to take the visitor on a spiritual...