After a walk of around 7km amid the lush green forests of Sanjay Gandhi National Park, the Kanheri caves emerge as a subtle reminder of India's rich history. The largest cluster of rock-cut structures in India, Kanheri has over 100 caves carved out of a single black rock, which served as instruction centres for Buddhist monks in the 1st century BC. This Sunday, a heritage trail led by Dr Suraj Pandit aims to explore the journey of Buddhism through Kanheri's architecture.