Medieval monument of Mt Abu, is the Achalgadh fort commissioned by Rana Kumbha, who was responsible for dozens of gigantic fortresses in southern Rajasthan, with massive battlemented walls and a situation on a mountain peak offering great views. A steeply winding path leads up to the 15th century fortress and the temples within the fortified walls, great for a view of the countryside.
The carved Jain temples are a 10 minute climb, worthwhile for the view and the sculpture. Below the path is the Achleshwar temple, with a Nandi said to be made of the five metals-gold, silver, copper, brass and zinc, called Panchadattu, and weigh more than 4 tons. The temple is believed to have been built in the 9th century around a toe print of lord Shiva, with a hole claimed to reach the netherworld, a natural Shivalinga and idols of a crystal like stone, which looks opaque, but when a candle is placed behind it sparkles like crystal. Nearby is the pleasant looking Mandakini lake, enclosed by rocky hills, with images of a Rajput king and buffaloes. According to legend, the tank was filled with ghee and the watering hole of demons disguised as buffaloes until they were shot by Raja Adi Pal.
Source: Rajasthan Tourism