Thailand has had Street View as far back as 2012. This post on the Google LatLong Blog says that over 150 other places and national treasures have recently received Street View. However, many of the places listed have Street View dated 2014, and the first place mentioned, Sukhothai Historical Park, even has Street View from 2013. So either they have taken a really long time to process the imagery, or they have made a mistake somewhere. Nevertheless, Thailand has some really beautiful places and is well worth a visit.
Expect to see elephants, spikes and intricate carving.
Sukhothai Historical Park. Explore in Street View
Sanctuary of Truth. Explore in Street View
Ancient Siam. Explore in Street View
Be sure to see the LatLong Blog for more locations to explore