Madurai is also known as 'Temple City' and also called 'City of Festivals'
Teppakulam means a Tank to be filled with water and once in a year this tank will be filled with water from the Vaigai river during the month of January/February for the 'Float festival' ([ Tamil, Teppa Thiruvizha (Thiruvila)]
During this festival, Lord Siva and Goddess Meenakshi will go around the Tank in a Teppam (boat) from the temple to the Center of the Teppakulam after taking 3 rounds in the water. Lot of people will be visiting and worship the God.
People crowd will be a lot during this festival time frame. Many from nearby villages, cities will visit during this festival. 
Other Links:
Meenakshi Temple: http//www.madurai.com/meena.htm
Teppakulam: http://www.madurai.com/teppam.htm (Map link)
Thirumalai Nayakkar Palace: http://www.madurai.com/palace.htm
Photos by Anent Prakash
