Hanuman Mandir near the Sangam has deep mythological roots. It is believed that this reclining idol of Lord Hanuman appeared on its own (Swayambhu) and is associated with several legends from the Ramayana. One popular belief is that after setting Lanka ablaze, Lord Hanuman returned and rested at this very spot, which is why he is shown lying down. Another legend says that the idol protects Prayagraj from natural calamities and river floods. Interestingly, during high floods, the river Ganga is said to touch Hanuman’s feet—a rare and symbolic phenomenon that draws massive crowds.

Architecturally, the temple is modest yet powerful in presence. The idol itself is carved out of stone and coated in vermilion, often adorned with flowers and silver ornaments. The temple has stood for centuries as a testimony to the city's spiritual vibrance. Pilgrims believe that praying here washes away sins and brings divine blessings. The temple plays a significant role during the Maha Kumbh and Ardh Kumbh, with millions offering prayers at this sacred site. Despite its simplicity, its spiritual significance ranks it among the top religious destinations in Prayagraj.