The Hindu Temples built by a Dynasty called Kakatiyas in South India (12th & 13th Cent.A.D.) were found dilapidated. Defective foundations and poor workmanship were thought as possible reasons for dilapidation of these temples by some experts. The possibility of damage by earthquakes was mooted in some quarters. While all these studies were based on observation, a team of Engineering professors carried out Scientific studies on these temples (1986). Recently two dilapidated temples were dismantled completely (for reerection by way of Anastylosis) which gave an opportunity to see the concealed parts of the Kakatiyan temples for the first time. The author is directly associated with the dismantling of one of the temples. Basing on the information obtained after dismantling, an attempt is made to understand the causes for dilapidation of the Kakatiyan Temples.