Wat Rong Khun in Chiang Rai Province, Thailand. It's a 3-hour ride from Chiang Mai where we stayed for the Yi Peng Festival. The design of this temple is very intricate. I have high praises to the builders behind it. It's really pretty up close and even at a far distance.
I learned that there is also a Black Temple as beautiful as this. But we're pressed for time. We decided not to push through and visit some other time.