Desh

http://www.divyadesh.com/

Kataksham

https://divyakataksham.wordpress.com/

Koyil

http://koyil.org/

Garland

http://immersedimmersed.blogspot.com/search/label/Andal

Three in One

Sage Parasara sprayed the nectar he obtained from the milk ocean in the Manimutha River, built a hermitage on the river bank and was performing penance.  Three demons

1. Thanjakan, 
2. Thandakan and 
3. Tharasura with their deathless boon granted by Lord Shiva began to harass the sage and others performing penance with him.  

The sage advised them to shed their demon traits and reform themselves.  They turned a deaf year. The sage appealed to Lord Shiva for protection.  Shiva sent Kalidevi to destroy them.  But they drank the nectar mixed river water and came back alive to continue their atrocities.  Sage approached Lord Vishnu.

1. Mahavishnu took the Narasimha form and defeated Thanjaka who took the elephant form.  Lord placed the demon on His lap to kill him when he gained wisdom and shed his cruel traits.  He also begged the Lord to stay in the place and bless all.  He also begged that the place should be named after him.  His boon granted, the place came to be known as Thanjamapuri. 
2. Seeing the defeat of Thanjaka, Thandakan hid himself under the earth.  Lord became a Varaha, entered the hiding and killed the demon.  
3. Tharaka was killed by Kali.  

After the destruction of the three demons, Lord appeared before Sage Parasara as Neelamega Perumal.  Lord is gracing this place in three names in three separate temples.

Lord Vishnu who destroyed the demons graces in three separate temples as 

1. Neelamegar, 
2. Manikundra Perumal and 
3. Veera Narasimha in three forms. 

Saints Boodhathazhwar and Tirumangai Azhwar had sung the glory of the three Perumals together in their hymns. The three temples form a single Divya Desa.

https://www.google.com/search?site=imghp&tbm=isch&source=hp&biw=1280&bih=643&q=Neelamega+Manikanda+Perumal+and+Veera+Narasimha  

Pancha Kamala Kshetram

known as the Pancha Kamala Kshetram due to the five factors –

1. Lord Kamalanathan, 
2. Goddess Kamalavalli, 
3. Kamala Pushkarani, 
4. Kamala Krithis Vimanam and 
5. Kamala Kshetram.

http://en.wikipedia.org/wiki/Hara_Saabha_Vimocchana_Perumal_Temple 
https://www.youtube.com/results?search_query=Hara+Saabha 

Pot

As part of His creation and re-creation process Lord Vishnu, at the end of the Tretha yugam asked Brahma to make a pot and put the quintessential and the eternal Vedas and sastras into it and carry them forward to the next yuga.    

1. kudavasal indicates mouth of the pot, 
2. kumbakonam the angle and 
3. thirucherai the content  

http://en.wikipedia.org/wiki/Kudavasal
https://www.youtube.com/results?search_query=Kudavasal 

http://mbakon.blogspot.com/

http://8div.blogspot.com/2015/05/pancha-sara-kshetram.html  

Pancha sara kshetram

This is a pancha sara kshetram: 

1. Kshetram – Sarakshetram; 
2. Temple tank – Sarapushkarni; 
3. Vimanam –Saravimanam; 
4. Lord – Saranatha; 
5. Goddess – Five Goddess.

Wiki 

http://en.wikipedia.org/wiki/Tirucherai_Saranathan_Temple 

Five Goddess  - 

1. Sridevi, 
2. Bhoodevi, 
3. Neeladevi, 
4. Mahalakshmi and 
5. Saranayaki.   

Tube 

https://www.youtube.com/results?search_query=Tirucherai+Saranathan  
  

The Lord here was worshiped 

1. by Brahma in Kritha yuga, 
2. by Saints in Tretha yuga, 
3. by Garuda in Dwapara yuga and 
4. by Mother Cauvery in Kaliyuga. 

https://freeglobaluniversity.blogspot.com/search/label/YUGA

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.

Vallalar

Sri Ramalinga Swamigal (Vallalar) has composed five verses in Tamil in praise of Lord Sri Veeraraghavan, after having been relieved of acute stomach ache due to His grace.

https://www.google.com/search?site=imghp&tbm=isch&source=hp&biw=1280&bih=600&q=Vaidya+Veeraraghava+Swamy+Temple

https://www.youtube.com/results?search_query=Vaidya+Veeraraghava+Swamy+Temple