Sri Venkateswara Swamy Temple is a landmark vaishnavite temple situated in the hill town of Tirumala at Tirupati in Chittoor district of Andhra Pradesh, India. The Temple is dedicated to Lord Venkateswara, an incarnation of Vishnu, who is believed to have appeared here to save mankind from trials and troubles of Kali Yuga. Hence the place has also got the name KaliyugaVaikuntham and Lord here is referred to as Kaliyuga Prathyaksha Daivam. The temple is also known by other names like Tirumala Temple, Tirupati Temple, Tirupati Balaji Temple. Venkateswara is known by many other names: Balaji, Govinda, and Srinivasa.
The Tirumala Hills are part of Seshachalam Hills range. The hills are 853m above sea level. The Hills comprises seven peaks, representing the seven heads of Adisesha. The seven peaks are called Seshadri, Neeladri, Garudadri, Anjanadri, Vrushabhadri, Narayanadri and Venkatadri. The temple lies on the seventh peak -Venkatadri, on the southern banks of Sri Swami Pushkarini, a holy water tank. Hence the temple is also referred to as "Temple of Seven Hills". Tirumala town covers about 10.33 square miles (27 km2) in area.
The Temple is constructed in Dravidian architecture and is believed to be constructed over a period of time starting from 300 AD. The Garbagriha(Sanctum Sanctorum) is called AnandaNilayam. The preciding deity, Venkateswara, is in standing posture and faces east in Garbha griha. The temple follows Vaikhanasa Agama tradition of worship. The temple is one of the eight Vishnu Swayambhu Kshetras and is listed as 106th and the last earthly Divya Desam. The Temple premises had two modern Queue complex buildings to organize the piligrim rush, Tarigonda Venkamamba Annaprasadam complex for free meals to Pilgrims, hair tonsure buildings and a number of pilgrim lodging sites.
It is the richest temple in the world in terms of donations received and wealth. The temple is visited by about 50,000 to 100,000 pilgrims daily (30 to 40 million people annually on average), while on special occasions and festivals, like the annual Brahmotsavam, the number of pilgrims shoots up to 500,000, making it the most-visited holy place in the world.
It is around 435 km (270 mi) from Vijayawada, 571.9 km(355.3 mi) from Hyderabad, 138 km (86 mi) from Chennai , 291 km (181 mi) from Bangalore and 781.2 km(485.4 mi) from Visakhapatnam There are several legends associated with the manifestation of the Lord in Tirumala. According to one legend, the temple has a murti (deity) of Lord Venkateswara, which it is believed shall remain here for the entire duration of the present Kali Yuga.
Brahmotsavam is celebrated in memory of Lord Srinivasa's self manifestation day under the leadership of Brahma the son of vishnu. The nine days Brahmostavams are one of the magnificent festivals celebrated at Tirumala. This is most important festival among all festivals in Tirumala on every year Sep (or) Oct.
Pedda Sesha Vahanam
After the Dwajaarohanam the Lord is taken out in a procession in the evening on Aadi Sesha the thousand headed Chief Serpent God as his vehicle. Aadisesha is the seat on which Lord SriManNarayana rests in his abode Sri Vaikunta. Tirumala hills the abode of Lord Venkateswara is said to be the manifestation of Lord Aadisesha. Pedda Aadisesha vahanam will be seven headed.
Chinna Sesha Vahanam
On the second day morning the Lord is taken out in a procession on Vaasuki (Serpent God) as his vehicle. In Bhagavath Geetha Lord Sri Krishna says He is Vaasuki among the serpents. Chinna Sesha Vahanam will be five headed.
On the second day evening the Lord is again taken out in a procession on Hamsa (Swan) as his vehicle. Hamsa or swan means ‘pure’. Hamsa is believed to have a high intellectual capability and can distinguish good from bad.
On the third day morning the Lord is taken out in a procession on Lion symbol as his vehicle. Lion is a symbol of royalty and power. Lord assumed the form of half man and half lion in his Narasimha Avathara. Lord Sri Krishna says in Bhagavath Geetha that he is the Lion among the animals.
Muthyala Pallaki Vahanam
On the evening of the third day, the Lord is again taken out in procession along with his concerts Sri Devi and Bhoo Devi in a palanquin decorated with a canopy of pearls. Pearl is said to be a symbol of purity and royalty.
Kalpa Vruksha Vahanam
On the fourth day of the festival the Lord is taken out in procession in the morning on Kalpa Vruksha as his vehicle signifying that he is the giver of boons to his devotees and fulfills their wishes.
Sarva Bhoopala Vahanam
On the fourth day evening the Lord is again taken out in procession on a vehicle called as Sarva Bhoopala Vahanam signifying that He is the Lord of Lords.
On the fifth day morning the Lord is taken out in procession decorated in the attire of Mohini Avatharam (Ksheera Sagara Madhanam) the one who has distributed the Divine Nectar.
On the fifth day evening the Lord Sri Venkateswara is taken out in procession specially decorated, with his main devotee and chief vehicle Garuda (Garukmantha) the king of birds as his vehicle. It is a unique occasion when thousands gather together and would like to witness the procession. It is believed and said that it is highly meritorious and mukthi pradham to have darshan of the Lord seated on Garuda,the vahana of lord vishnu. During Garuda vahanam, Venkateswara will be decorated by garlands sent from Srivilliputhur Andal temple. These garlands were adorned to Andal before sending it to Tirupati. These traditional garlands are made of tulsi, sevanthi and sampangi flowers.  Every year Tirupati Venkateswara’s garland is sent to Srivilliputtur Andal Temple for marriage festival of Andal.
On the sixth day morning the Lord is taken out in procession with Lord Hanuman as his vehicle. Hanuman was the personification of the most trusted and self less service to the Lord in his avathara as Sri Rama in Treta Yuga. Undoubtedly Lord Hanuman was the greatest devotee of Lord Sri Rama.
Swarna Rathotsavam / Gaja Vahanam
On the sixth day evening the Lord is taken out first for Swarnarathotsavam and then in procession on Elephant (Gaja) or Airavatham as his vehicle. We find in Sri Madbhagavatham (Gajendra Moksham) Lord instantly coming to the rescue of Gajendra and get him relieved from the clutches of the Crocodile.
Surya Prabha Vahanam
On the seventh day morning the Lord Venkateswara is taken out in procession with Sun God driving the Chariot. Purusha Sooktha describes Sun as born from the eyes of Lord SrimanNarayana (Chaksho! Suryo Ajayathah!). Sun is said to be an incarnation of Lord Maha Vishnu (Surya Narayana) .
Chandra Prabha Vahanam
On the seventh day evening the Lord is again taken out in procession with Moon as symbol of his vehicle. Purusha Sooktha describes Moon as "Chandrama Manaso Jaathaha" (Moon is born from the mind Lord Maha Vishnu). Moon is the commander of mind and is a symbol of cool and pleasantness. Both these rituals are symbolic significance that He is the cause for day and night.
On the penultimate day (eighth day) morning the Lord Venkateswara is taken out in procession along with his consorts seated on a fully decorated Chariot pulled by the devotees with the chanting of Govinda Nama Smarana. Tirumala will be flooded with devotes to witness this occasion. It is believed and said that those who witness the Lord seated on the Chariot during Rathostavam will not be reborn. Idols of Daruka the charioteer of Lord Sri Krishna and four horses are placed before the Lord on the chariot. one should be blessed to witness this at Tirumala.NAMO NARAYANAYA
On the eighth day evening the Lord is again taken out in procession with Aswa (Horse) as his vehicle symbolizing the forthcoming Kalki Avathara. Lord Venkateswara used to ride on a horse during hunting of wild animals. Lord assumed the form of Horse head during his avathara as Hayagreeva.
On the ninth day morning, last day of the Brahmostavam, special abhishekam (Avabhrutha Snanam) is held for utsava moorthy of Lord Venkateswara and his concerts Sri Devi and Bhoo Devi in the complex of Lord Varaha Swamy temple on the banks of Swamy Pushkarini. Later, the Sudarshana Chakra (Disc weapon of the Lord) is immersed in the waters of Swamy Pushkarini. We find large number of devotes simultaneously taking a dip in the Pushkarini waters at that time. It is believed and said that one will get absolved from sins by taking a dip in Swamy Pushkarini simultaneously along with the Sudarshana Chakra on this day.