This is Samadhi of Mataji behind the Gorakhnath Temple on top of Gorakhnath Hill.
There is space to sit and meditate. You can go into meditative states effortlessly here.
How to get there
The Samadhi is on top of Gorakhnath hill, 500 m north of Indreshwor Mahadev Temple. The samadhi is on the right side of the washroom. This samadhi does not have any temple structure.
Map: https://maps.app.goo.gl/QMZyw4UozkAUu1xcA