Phanom Rung Historical Park, Buriram Province

Travel is convenient, just set your GPS. There is ample parking space, many souvenir shops, and a museum section that provides historical background before you see the real thing. Be careful when walking around the actual site as the stones are sharp. People back then probably had shoes; walking barefoot might be tough. Inside, it is like other castles, grand and majestic as reputed.