If you're on the way to Chiang Dao or Pai, you must stop to Wat Ban Den: it is a huge buddhist complex composed of several halls and stupas. Its colorful statues and immensity have made its reputation. Wat Ban Den is a huge temple that keeps getting bigger as it's still under construction. Architecturally speaking, you will find a lot of different elements and styles with an amazing sense of detail. I found it very beautiful and I'll probably go back there in a few years to see the new temples they'll build. It's open 7AM to 6PM, best visited during golden hour, but the place isn't crowded yet, so you can visit it anytime. you can easily launch the drone from the parking area.