Throughout the year, each of Bali's temples celebrates its odalan, or anniversary. That adds up to a lot of festivals for spirited travelers to choose from, considering that the island has tens of thousands of temples. But it's the celebration at Pura Besakih, also known as the "mother temple," that will likely produce the best memories for you. Every April, Balinese families honor their largest temple by climbing through air heavy with incense and humming with ancient prayers to give thanks for a prosperous life. Besakih, a lava-rock sanctuary, is built on the lush, green slopes of Bali's mighty, 10,000-foot-high Mount Agung volcano, which erupted in 1963. Mysteriously, the volcano's fiery river parted and flowed around the temple. Maybe it was luck. Or maybe it had something to do with the offerings locals and travelers bestow at the mountainside shrines. Walk alongside women balancing woven baskets of fruit and flowers on their heads and listen to the haunting, gong-like sounds of the gamelan (a traditional Balinese orchestra), and you may feel like other mystical forces were at work in sparing the millennium-old temple.