There are two stupas in Luang Nam Tha and from many parts of town it's possible to see the gleaming golden stupa on top of the hill to the northwest; this one gives you the view.
To get there, simply walk or drive up the main road and take a left at the petrol station until you hit the base and head up the stairs or road. The stupa itself is unremarkable and similar to many you will see throughout Laos, but there are a few Buddhas and it does make for a nice photo. You can enter inside the stupa for 5,000 kip, a small price to help with maintenance, and sometimes you will hear haunting chanting emanating from within.
The best part is the partial view of the town below. It's especially pretty in rainy season when the surrounding hills are green, and also anytime of year at sunset when the sky can sometimes turn a hundred shades of pink and red.