I have written on Unique Temples of India, which have special special features.
Some of them are aligned Longitude wise, like Chidambaram, Kanchipuram and Kalahasthi,
Temples where the shadow of the Murthi falls on the wall in the sanctum, where there is no source of Light.
The Idols change colors once in every one and a half hour,once in fourteen days.
Where Snakes perform pooja.
Crocodile guards the temple.
Where lord Subrahmanya idol sweats on the Kanda Sashti day.
Tirumala hill resembling the profile of the Presiding deity, Lord Venkateswara, Balaji.
The idol of Lord Balaji of Tirupati has a temperature of 110 F early in the Morning around 4.30 am when the Abhishekam is perfomed and He sweats!
‘The idol of the Balaji always maintains a temperature of around 110*F. The Thirumala Hills is in cold climate at a height of about 3000 feet. ABHISHEGAM(sacred bath) is done early in the morning around 4.30AM to the idol with Cold Water,Cold Milk as well as other DRAVYAMS. But immediately after the sacred bath fine particles of water,appear on the body of the idol just like sweating.The ARCHAKAS,PUROHITS, gently swap the sweating by pressing a silken cloth on the body of the idol.On allThursdays, when the ornaments put on the idol of Balaji are removed just before the commencement of the sacred bath they are found to be very warm.’
I cross checked the information with the traditional archakas who perform this ritual to Lord Balaji at Tirupati.
For Tirupati e services visit Link below.
Citation and reference..