There is a Famous Temple in Sankaran Koil, Tamil Nadu where Shiva and Vishnu are together.
I am providing a list of such temples in Kerala.
1.Navaikkulam Shankaranarayana Temple in Thiruvananthapuram district
2.Ramanthali Shankaranarayana Temple in Kannur district
3.Thiruvegappura Shankaranarayana Temple in Palakkad district
4.Puthukode Shankaranarayana Temple in Palakkad district
5.Panamanna Shankaranarayana Temple in Palakkad district
6.Shankaranarayana Shrine of Vadakkunnatha Temple in Thrissur district.
