CHIANG RAI, Thailand — In Thailand, it’s not uncommon to hear the chanting of the monks as you wake up on a Sunday morning, or to walk past a hoard of saffron-robed novices on your way to the market.

Michael Jackson, Spiderman, Harry Potter… expect to see some surprising inclusions at Wat Rong Khun, an extraordinary Thai Buddhist landmark.

Discover the treasures of the Buddhist Cave Temples of Xiangtangshan. Once scattered around the world, these artifacts were recently brought together for the first time in almost a century in "Echoes ...