Photos of the Khao Phanom Rung Festival 2005 in the Phanom Rung Historical Park (Thailand)
The traditional festival takes place every year at full moon in the 5th lunar month, April. There are virtually no tourists there, but it's a very popular event for Thai people.
It's an amazing event, visually stunning and highly recommended if you travel in Thailand at this period.
More information on the Prasat Phanom Rung festival can be found here: www.sundial.thai-isan-lao.com/tpr-festivities.html
For more information on the Phanom Rung Historical Park, check this Wikipedia article.