Also known as the Nagala Hills, these are in the Chittoor District and a hidden treasure of Andhra Pradesh. The hills are very close to the city of Chennai and are a superb option for adventure seekers. The natural beauty of this place makes your trekking experience even better as you go higher up. The Narayana Swamy Temple is another reason for which people come here. The Nagala Waterfalls with 3-4 natural pools looks divine. Apart from pools, this place also has water slides naturally like the artificial ones you will find in theme parks. You shopuld take the route covering the whole waterfall while trekking to make your experience even more memorable. Summer is absolutely not an ideal time if you want to trek and neither is monsoon. Make sure you carry a bag with an extra set of clothes, water and some food along with an emergency kit out here.