Borobudur
Borobudur, a name deriving from an expression meaning ‘Mountain of accumulation of merits of the ten states of Bodhisattva’ is commonly thought of as a Buddhist structure, yet its initial construction was planned and conducted by Hindu builders sometime around 775AD.
The enormous first and second terraces were completed by a declining Hindu dynasty, construction was then halted for some years, and later, from 790 to 835 AD, the Buddhist Sailendra dynasty continued and finally completed the great stupa.
The huge stone mass might have then been permanently abandoned, for it was difficult to adapt to the needs of Buddhism.

