Batu Caves (Tamil: பத்து மலை) is a limestone hill that has a series of caves and cave temples in Gombak, Selangor, Malaysia. It takes its name from the Sungai Batu (Stone River), which flows past the hill. It is the tenth (பத்து - Pathu in Tamil) limestone hill from Ampang. Batu Caves is also the name of a nearby village.
The cave is one of the most popular Tamil shrines outside India, and is dedicated to Lord Murugan (Tamil God Murugan Tamil: தமிழ் கடவுள் முருகன்). It is the focal point of Hindu festival of Thaipusam in Malaysia.
Batu Caves in short also referred as 10th Caves or Hill for Lord Muruga as there are six important holy shrines in India and four more in Malaysia. The three others in Malaysia are Kallumalai Temple in Ipoh, Tanneermalai Temple in Penang and Sannasimalai Temple in Malacca.
Source: Wikipedia, https://en.wikipedia.org/wiki/Batu_Caves
It was 38℃ hot, 100% humidity, thunderstorms rolling through, and full of people. In other words, a normal day in Malaysia. It was also incredibly calm and serene at points, despite being surrounded by hundreds of people.