Candi Sewu is the second largest Buddhist temple in central Java after Borobudur and dates from 8th to 9th centuries AD. The temple is dedicated to the Buddha Vairocana, whose statue would have been contained in the main chamber, however it is no longer there. The complex is based on a Mandala design, a trait of Vajrayana school complexes. Vajrayana learning came to Java in the 8th centruy through contacts with the Pala empire. The main temple structure has been well restored and can be explored inside. There are dozens of smaller structures surrounding it, some restored but many simply piles of stones. Although just adjacent to the main Prambanan temples, few visitors to that site make it to Candi Sewu, making it a more peaceful place to explore.