Kunda Cave is mainly the ruins of an old Kunda Palace, which is about 3-4 miles from the Kunda village in Chatra District. The palace was built between the end of 17th century and the beginning of the 18th century. The cave is around half a mile from the old palace, which is connected through a narrow path. There is also a shallow stream running through the region and tourists can see a central hall inside the cave, which is used as a resting floor.

Travellers can also see a big shiva linga and a sleeping room of a hermit inside the cave. Large number of visitors gathers here on the 14th day of Phalgun for offering holy water to the shiva linga.

Source:

http://www.holidayiq.com/Kunda-Cave-Chatra-Sightseeing-764-312.html