Sila Thoranam, Tirumala: Sila Thoranam, the name itself means that it is naturally formed arch of rock, Sila meaning Mountain or Rock and Thoranam meaning Arch. It is about one kilometre north of Sri Varaha swami Temple. This rock formation is said to be 1500 million year old and stretches 25ft in length and 10ft in height. The natural rock formation stands as the nature s wonder and is not to be missed while on your trip to Tirupati. There are no buses available to this place but you can reach here by taxi or private vehicle. You can also walk up to the Sila Thoranam as it is just twenty minutes away from Sri Varaha Swami temple.