Batu Caves, 13km north of KL, is home to the Sri Subramaniam Swamy Temple. The caves were discovered in 1892 and the temple was built inside the largest hall during that period. The temple is about 100 metres from the ground. The above photo is a statue of Lord Vishnu at the entrance of the cave (could not avoid the clipping). The enormity of the cave is not visible from the outside. You get the idea only when you enter. Not surprisingly the inside of the cave is quite cool andrelaxes you down after the slightly tiring climb. The openings at the top of the cave serve as ventilation for the air inside.
I've heard that the Thaipusam festival, held around the start of February, attracts around 100,000 devotees from around Malaysia! It would be a sight to watch.