I happened to be in Chinnakkada Junction on chathayam Day, and was treated with the Rally by SNDPY.
These yellow hat-rellas (hat + umbrella) were part of their uniforms for the Rally.
Went to Mahabalipuram with my chennai buddies.
Group of Monuments at Mahabalipuram, Tamil Nadu is listed in http://en.wikipedia.org/wiki/List_of_World_Heritage_Sites_in_Asia_and_Australasia
The rock in picture is not among the list :) !!!!