
Photo: Marcus334 at English Wikipedia (Original text: Indian Institute of Astrophysics), CC BY 2.5 via Wikimedia Commons
The Kodaikanal Solar Observatory is a solar observatory owned and operated by the Indian Institute of Astrophysics. It is on the southern tip of the Palani Hills 4 kilometres (2.5 mi) from Kodaikanal.
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A cave which became very famous after the movie Guna. Very steep and risky to get in. The public may not be allowed to enter this cave nowadays, though it's a very good place to take pics. But if you are not a professional spelunker, a trip to this cave may be your last. Getting back will be problem as it's very dark and there could be about a 90% chance of suffering a free fall.
It has huge steep cliffs. During summer rainy days, the cliffs get completely hidden due to excess of fog. Watch out for the cross at the top of the mountain hoisted by an English adventure enthusiast.You can see the cross by an available telescope.
Kodaikanal Lake
If you are going in winter, go boating in the evening, as it's an amazing experience to boat through fog settling on the lake. The lake is very near the bus stand. This is a star-shaped lake and walking around it during the night is one of the best walking experiences you can have in your life. Be cautious, there are lot of dogs around this lake and some places are extremely dark. Walk between 6 and 7PM, then head back to your room.