Even though the history of Mumbai can be traced back to the Stone Age, we still don't know much about our everyday surroundings — let alone the finer details.

For instance, the city's beaches make for great morning or evening walks, or after-college hangout spots. But what beyond that? The answer is something that Sachin Rane is hoping to convey. As the founder of Naturalist Foundation, Rane leads walks around the city with a focus on biodiversity.