This is an ancient site where Buddha went into 6 years of self-mortification before enlightenment. There is a place to sit and meditate inside the cave. You can go into meditative states here effortlessly.
How to Get there
Currently there is no direct bridge between Bodhgaya to Dungeshwari. So it takes an hour from Bodhgaya to Dungeshwari on auto or car. And it will take about 25 minutes drive from Gaya to Dungeshwari. Once bridge will be completed, it will take about 20 minutes from Bodhgaya to Dungeshwari.
Map: https://goo.gl/maps/T8W7SSSQG2NT5Vr77
About Dungeshwari Cave
Dungeshwari Cave Temples, also known as Mahakala caves, is situated 12 km north-east of Bodhgaya, Bihar. There are three caves containing Buddhist shrines, where the Buddha is believed to have meditated. Dungeshwari Cave Temples are the ancient caves. These are caves Lord Buddha underwent years of self-mortification before descending to Bodhgaya.