Ta Som is a temple you can visit through the circuit called “big tour” suggested by the Cambodian tuk-tuk.
Here is a description from Wikipedia:
“…Ta Som at Angkor, Cambodia, is a small Buddhist temple dedicated to the father of King Jayavarman VII. It was built at the end of the 12th century. It is east of Neak Pean and has not been restored...”
I’ve found a nice videos on the internet showing the temple: