The ancient Sri Harihareshwar temple, located in Harihar, Karnataka, is an important spiritual and architectural miracle since the Hoysala period. The temple specifically dedicated a common form of Lord Shiva and Lord Vishnu to Harihar, which symbolizes the association of Shaivism and Vaishnavism. The idol is a striking representation in itself - Shiva occupies the right half and Vishnu the left, affecting each of the related properties.Built around 1223–1224 CE by Hoysala chief Polalva under King Virarasimha II, it was later rebuilt by Soma in 1268 CE by a commander of King Narasimha III of Soma.
The temple is built in classic Hoysala architectural style, which has such a soap structure with a staggering mantapa (hall), beautifully carved lathe-swing-swing columns, and adoption of a decorated roof. In the old Kannada, the heroes' stones and inscriptions increase the historical and cultural prosperity of the temple.
An attractive legend surrounds the temple: Demon Gausur, authorized by a blessing, which made him individually immune to both Shiva and Vishnu when the two gods merged into Harihar. It is believed that this divine incident took place at the gathering of the rivers Tungabhadra and Haridra near the current Harihar.
The most important festivals include the car festival (Rath Yatra), which attracts thousands of devoted Bharat Hannam, and Nagpanchami, characterized by a unique ritual, including the Holy Mantra and Deaf. The temple is still a vibrant center of affection and history, which attracts pilgrims and tourists throughout the year.