Varaha Kshetra
Sri Maha Vishnu rescued Earth which was taken over by Hiranyaksha to Patala Loka (underworld) in the form of Adi Varaha - a wild boar with tusks. He fought a fierce duel with Hiranyaksa and killed him. He then slashed the water and brought up the Earth on his tusks. Brahma, the Devas and the sages extolled Adi Varaha's virtues, by chanting the Vedic mantras. They prayed to Him to re-establish the Earth as before. Adi Varaha obliged them, and called upon Brahma to recreate the world. He expressed his desire to reside on the Earth to protect its people. He commanded his vehicle, Garuda to fetch Kridachala (an extensive natural hill with lofty peaks, embedded with gold and precious stones, and which resembled Adisesha in shape) from Vaikuntam. Garuda brought Kridachala and deposited it on a sacred spot (to the East of Swami Pushkarini) chosen by Adi Varaha. Brahma and the other holy personages requested the fearsome-looking Adi Varaha to assume a tranquil and composed look, and rest on the hill to protect men and grant boons to people unable to reach God through Dhyana Yoga (meditation) and Karma Yoga (doing one's own duty). Adi Varaha appeared with four arms and a white face. He was adorned with jewels and accompanied by Bhu Devi. He resolved to stay at Venkatadri, under a divya vimana, to grant the prayers of men.
Read more about this topic: Legend Of Tirumala