Indonesian Buddhists released thousands of sky lanterns in celebration of their Vesak holiday at Borobudur Temple in Java on Wednesday. /VCG Photo

Vesak Day, also known informally as Buddha’s Birthday, falls on the full moon of the lunar month of Vesakha (usually in May or June), marking the birth, enlightenment and passing away of Gautama Buddha. /VCG Photo

Built in the ninth century, Borobudur Temple is the world's largest Buddhist temple and a UNESCO heritage site. It is a destination for pilgrimages and a venue for annual Vesak Day celebrations. /VCG Photo

Millions of Buddhists around the world take part in Vesak Day celebrations. /VCG Photo