The Bhitargaon Temple in Kanpur, built in the 5th century AD during the Gupta Empire, is one of India's earliest surviving brick temples, notable for its terracotta sculptures and architectural features like the 'Hindu arch' and a tall shikhara. It represents a transition from rock-cut architecture to brick structures in regions with limited stone availability. The temple is believed to have been dedicated to Lord Vishnu based on the depiction of the Varaha avatar, making it a significant monument in Hindu architecture.