This is a consecrated space for sadhana. There is a place to sit and meditate up to 2 people at once inside the cave at once. You can go into meditative states here effortlessly. Naropa, Tilopa & Bhairavi Caves are next to each other. If they are locked, you can ask the caretaker to open the caves.
How to get there
From Pashupatinath cremation grounds, walk upstream along the left banks of Bagmati River. As you walk upstream, you will see the entrance towards the left.
The Bhairavi cave is on the right side of Naropa & Tilopa Caves.
Map: https://goo.gl/maps/Lgt71jVsApqbX1Gf8
About Bhairavi:
Bhairavi (Sanskrit: भैरवी) is a Hindu goddess, described as one of the Mahāvidyas, the ten avatars of the mother goddess. She is the consort of Bhairava.
The name Bhairavi means “terror” or “awe-inspiring”. She is the fifth of ten Mahāvidyas. She is also called Tripurabhairavi. “Tri” means three, “Pura” means fortress, castle, city, town, etc. Tripura convey three different stages of consciousness i.e. active, dream and deep sleep. She is in the form of all triads and once these triads are transcended, it is believed that Brahman is attained. Hence, she is called Tripurabhairavi.[4][5]
Source: https://en.wikipedia.org/wiki/Bhairavi