Dating back to the Paleolithic period, the famous rock shelters of Bhimbetka were discovered by Dr. Vishnu Shridhar Wakankar. Out of the 750 caves, 500 are adorned by paintings of animals, people and daily activities. The older paintings are bigger and have just an outline, while the newer ones are smaller, detailed and coloured. One of these, showing an enormous red bison attacking a man, is said to be visible only when the sunrays hit it from a certain direction. No surprises then that these close to 30,000 years-old paintings, today, are a UNESCO World Heritage Site.