Kherlen Bar City (Kherlen bar khot) is the location of some small-scale ruins and a 3m-high tower from a 12th century city, once part of the ancient state of Kitan. There are also some balbals (Turkic stones believed to be grave markers) and, predictably, a Chinggis Khan memorial of sorts: a rock called the 'Chinggis Bed', which commemorates his stay here. You can see a picture of the tower in the Choibalsan History Museum.
Kherlen Bar Khot (Kherlen bar khot) is about 90km West of Choibalsan, in the sum of Tsagaan Ovoo. It is on the main road between Choibalsan and Undurkhaan, and is worth a look if you have your own vehicle.