According to mythological stories, the Kasar Devi Temple was established in the 2nd century. This ancient temple, located on the Kashyap Hill, is believed to have been founded by followers of the ancient Kashyapa tradition who came from Western Asia around 900 years before Christ. It is said that the community's name gave rise to the name of Kasar Devi. In addition to this, according to local legends, the temple was built by the Katyuri kings, who were known for their devotion to Goddess Durga. It is said that Goddess Katyayani first appeared in the Kasar Devi Temple in Almora. Therefore, the puja of Goddess Katyayani, the 6th form of Navadurga, is performed in this temple. It is believed that Swami Vivekananda also meditated here in 1890, after which he attained spiritual enlightenment. During the 1960s and 1970s, this place gained popularity during the hippie movement. The entire area around the Kasar Devi Temple is a magnetic field known as the Van Allen Belt of the Earth. It is said that within the Earth's crust, there is a massive geophysical lump of magnetic charge, known as radiation. Such a phenomenon exists in only three places in the world: Kasar Devi, Machu Picchu in South America, and Stonehenge in England. NASA scientists have been studying the reasons behind the formation of this belt in the Kasar Devi Temple for several years. There are 8 GPS markers designated in the temple premises, which NASA has used to explain Gravity Point.

Devotees believe that any wish made in this temple is fulfilled by the goddess. The presence of a magnetic field around the temple is believed to generate a unique kind of energy in the body. It is said that the Buddhist guru Lama Anagarika Govinda practised special meditation in the Kasar Devi Temple cave. It is believed that meditating around the temple premises leads to the attainment of extraordinary power.

The construction of this temple, located at a mysterious cave-like spot on Kashyap Hill, is simple yet beautiful. The temple offers a peaceful atmosphere amidst lush greenery and scenic views. Inside the temple, there is an idol of Goddess Devi. Behind the idol, you can also see a stone carving in the shape of a lion. The beauty of nature here provides a sense of mental tranquillity. Over the years, the temple amid dense forests has undergone periodic renovations. Visitors can also practice yoga and meditation in the vicinity of the Kasar Devi Temple.

The Kasar Devi Temple doesn't have specific prasad offerings. However, devotees offer fruits, flowers, coconuts, and scarves to the goddess as per their choice.