Three Posture in Single Temple

Lord is seen in all three postures at this Divya Desam.

1. At the base Tier is Koodal Azhagar in a grand sitting posture under the Serpent Lord Aadhiseshan. 
2. Climbing about 20 steps on to Tier 1, one sees the Lord in a Sleeping Posture. 
3. And another 10 steps above, in Tier 2, is Lord Surya Narayanan in a standing posture.

http://en.wikipedia.org/wiki/Koodal_Azhagar_Temple
https://www.youtube.com/results?search_query=Koodal+Azhagar 

Overall
http://8div.blogspot.com/2010/11/appearance-of-revered-deities.html 

Pancha Samskara

The temple is the place where god Vishnu initiated Pancha Samskara (religious initiation) to Thirumangai Azhwar.
https://www.google.com/search?q=Pancha+Samskaram

Nachiyar temple Thirunaraiyur / Map
http://en.wikipedia.org/wiki/Nachiyar_Koil
http://wikimapia.org/5420623/Sri-Nachiyar-Temple

Also
1. Another specialty of the temple is only in this divyadesam, there is brahma in standing posture inside the temple.
2. It is the only temple among the 108 divyadesams of srivaishnavas where God Naraiyur nambi has the conch and charka in front of his face.