Chiang Rai - What's This ??

[airlana]

Hopefully someone can tell what this is.

It's about 20km north of Chiang Rai just right of the highway to Mae Sai.

Thanks in advance.

http://www.members.optusnet.com.au/airlana/CR1.jpg

and a close up

http://www.members.optusnet.com.au/airlana/CR2.jpg