Hall of Opium, Golden Triangle Park
One of the best museums in all Thailand and almost certainly the most interesting place to visit in the Golden Triangle, the Hall of Opium exhibits the history of opium around the world and in the area, the process of production, the effects of opium smoking and campaigns to eradicate and substitute the crop. There's even a tiny opium plantation inside! The Hall describes itself as "edutainment", and indeed this is something of an opium theme park, with the latest in snazzy multimedia exhibits and lots of subtle hectoring about the evils of addiction. To their credit, though, they don't whitewash Thailand's own history at all and even the CIA's exploits are covered in detail. Popular with tour groups and school children. Run by the royal Doi Tung Foundation, with profits going to charity.
The main area is the Thai riverside near the point where the rivers meet, which — in the dry season, when the Mekong runs low — is even marked by a handy sandbar. This in itself is pretty anticlimactic, so a series of increasingly bizarre attractions have been erected by the riverside to make up for it: there's a giant golden Buddha on a ship, elephant statues where you can clamber to pose atop a palanquin in exchange for a donation, of course, elaborate shrines to the royal family, half a dozen signs stating that yes, this really is the Golden Triangle and, inevitably, river cruise touts, souvenir shops and Western-style cafes.
Phra That Doi Pu Khao
à¸à¸£à¸°à¸à¸²à¸à¸¸à¸à¸à¸¢à¸à¸¹à¹à¸à¹à¸² is located on the hill just before the Golden Triangle and believed to have been built by a king of Wiang Hirannakhon Ngoen Yang in mid-8th century. Remains of antiquities are in the Viharn with crumbled Chedis.
House of Opium
A genuine privately run museum, unrelated to and much smaller and more serious in tone than the Hall. Lots of opium paraphernalia and information on the production process from beginning to end.