(best seen in original size)

One of the five

The nearest monuments to the main temple complex of Koh Ker
of Prasat Thom are five isolated temples belonging to the
Northeast group. Each of them housed a monolithic decorated
Lingam of enormous size on equally immense Yoni pedestals,
which symbolizes the female genitals. That is why the five
unique structures are called Linga-temples

Images below is the Shiv Linga housed in the temple above