The city has one of the most important temples of Hindu Shaivism, that is the Vadakunnathan temple.The district is also home of one of the most holiest Hindu Vaishnava temples, the Guruvayur temple.Though most of the monuments were well protected, the dolmen at Porkulam was in a neglected condition.The monument excavated under eminent Archaeologist B. Thapar, between 19, was under the Department of Archaeology.These menhirs are memorials put up at burial sites for the departed souls.
This place has unravelled monuments such as the Kudakkallu or Thoppikkallu (Mushroom stones or Umbrella stones) and 'Munimada' (Saint's abode).
Some experts are of the view that these are the remnants of the Neolithic Age in the development of human technology.
The Ramavarmapuram menhir is also believed to be a monument belonging to the Sangam period in the South Indian history.
Another monolithic monuments like Dolmens and rock-cut caves are at Porkulam, Chiramanengad, Eyyal, Kattakambal and Kakkad.
According to historians, the dolmens are burial sites.