This historic shrine at Armenian Street in Parrys was once the seat of Roman Catholic Archdioceses Of Madras and Mylapore, which at present is shifted to St Thomas Basilica (San Thome Church). Hence the name Co Cathedral was given to this church. Built in 1658, this cathedral hosts a large number of pilgrims from across the country. Believed to be one of the powerful religious places in the country by the locals, this shrine is a must visit place in Chennai.