"Venkatadri Samam Sthanam Brahmande Naasthi Kinchana"
Tirupati is located at the foothills of Tirumala. The city owes its existence to the sacred temple situated on the Tirumala Hills. Tirumala is the abode of Lord Venkateshwara. It's considered that he is one of the Avatars of Lord Vishnu. The temple is located atop Seshachala hills, often called as "Yaedu Kondalu" (seven hills). The temple of Lord Venkateshwara was built by the Tamil king Thondaimaan. Then reformed periodically by Cholas and later Telugu Kings.
Tirupati is the richest and the busiest pilgrimage center in the world (of any faith). The Balaji Temple is visited by millions of devotees from all over the world throughout the year a common site over here is the tonsured heads.