If you've watched any Muay Thai fights from Thailand, then you'll have heard of Lumpini and Rajadamnern (I hate trying to spell that...). They are the two most well known and prestigious stadiums to compete in. To have a high ranking or to hold a title in one of those stadiums is like being a world champion.
Anuwat has several titles at several weights from both stadiums
Here's some history/information on each of them.