Thirunallur Temple or Kalyanasundar Temple in Kumbakonam, Thanjavur District, Tamilnadu, India is a pilgrimage that has an unique Shiv Ling (the idol of Lord Shiva).The temple houses a unique Shiv Ling (the main deity) that keeps changing in colors, five times during the day, and some say, it changes for every 2 hoursand 24 minutes.