This is an ancient temple of Lord Vishnu in Narsingh Avtar and main temple of Joshimath. It has an idol of Lord Narsingh, which is considered established by Shankaracharya. As per local belief, the right hand of this idol has become as thin as hair. On the day when it will break, the mountains Jay-Vijay (which are situated on a way to Badrinath) shall join and become one and Lord Badrinath of Badrinath temple will disappear from present temple and re-appear as black stone (Shaligram) at new place called Bhavishya Badri, which is situated at a distance of 10 km from Joshimath. When Badrinath temple remains closed during winter every year, one idol of Lord Badri is brought to Narsinh temple and worshipped for six months.
source :- Wikipedia
HOW TO REACH
One can reach there only through road via NH58 from Rishikesh to Joshimath which is 256 kms. this temple is in walking distance from Joshimath bus stand.
Nearest Airport is Jolly Grant Airport
Nearest Railway Station is Rishikesh station