What's most interesting about Ta Kaeo is that it was never completed. Legend has it that the temple was struck by lightning during its construction, and all work was abandoned at a stage where the main structure was complete, but no adornment had been added; as such it serves as "Temple Structure 101." Also unique is the fact that Ta Kaeo is made of a rich green sandstone (elsewhere it's a deeper brown or grayish color). Built in the 10th century by Jayavarman V, the temple was dedicated to Shiva. The central prang once housed a lingam, and the three levels are all encircled by sandstone galleries. The climb to the top is very steep, but the view is well worth it.