The Dolmen Circle in Kodaikanal is a prehistoric site that boasts archaeological remains that can be traced back to the Stone Age. It is believed to be an area where pre-historic humans lived and were buried. Supporting this claim, archaeologists have excavated the remains of pre-historic dwellings and burial grounds from this area. Among such discoveries, dolmens and kistvaens throw light on the lifestyle and culture of the pre-historic humans that inhabited the area during the Stone Age. 

Dolmens are constructed out of two large erect stone slabs with a larger flat stone slab over them as a roof. It is believed that the pre-historic humans used the dolmens in this locality as a hideout and as a spot where they stashed their valuables. Remains of stone tools, weapons, utensils, and brass and copper ornaments have been found in this locality. Such remains demonstrate that humans lived in the area as early as 5000 BC. 

Though most dolmens have been damaged over time and cannot be excavated, two of these magnificent anthropological pieces have withstood the test of time and can still be seen on the slopes of the Western Ghats. One is located near the Ghat Road in Periyamkulam and the other one is in the hamlet of Pannikadu. These dolmens are believed to have been constructed around 5000 BC, and are now protected sites of archaeological importance. Kistvaens found near the dolmens are believed to be burial grounds used by the pre-historic inhabitants of the valley. Remains of burial urns and models of dolmens found on these hillslopes reveal fascinating insights into the culture and lifestyle of pre-historic humans.