What is significant about Chennai?

Hi Makkale, with many newcomers arriving in Chennai from different cities, as Chennai has become the third-best city for peaceful living, I would like to ask the inhabitants what makes Chennai special. This way, people from diverse backgrounds will have a chance to learn about its traditions (parampariyam). I expect some of us might share old details about Chennai and its significance that have been passed down orally from one generation to the next.