This is a Cave where Totakacharya, the disciple of Adi Shankaracharya had meditated. The cave is inside the Jyotirmath.
There is a place to sit and meditate. You can go into meditative states here effortlessly.
How to get there:
The math is in the town of Joshimath.
Map: https://goo.gl/maps/x8irsk3J8az6RNRs6
About Totakacharya
Totakacharya (IAST Toṭakācārya) 8th century CE) was a disciple of Ādi Śaṅkara, the Advaita Vedanta teacher. He was made the first Jagadguru (head) of the Jyotir Pīthaṃ, the original northern maṭha founded by Ādi Śaṅkara in Uttarakhand. He founded a maṭha by name Vadakke modam in Thrissur, Kerala.
Meeting Ādi Śaṅkara
The Mādhavīya Śaṅkaravijayam states that when Ādi Śaṅkara was at Śṛṅgeri, he met a boy named Giri. Ādi Śaṅkara accepted the boy as his disciple. Giri was a hard-working and loyal disciple of his Guru, Ādi Śaṅkara, though he did not appear bright to the other disciples. One day, Giri was busy plucking flowers for pooja, when Ādi Śaṅkara sat down to begin a lesson on Advaita Vedānta. He however did not start the lesson saying he was waiting for Giri to come back from his chores and singing lessons. At this, Padmapada pointed to a wall and said that it would be the same if Ādi Śaṅkara taught to this dumb object as he taught to Giri. Now, Ādi Śaṅkara wanted to reward Giri for his loyalty and devotion. Thus he mentally granted Giri the complete knowledge of all the śāstras (sciences). The enlightened Giri composed extempore the Toṭākāṣṭakam, a Sanskrit poem in the toṭaka metre, in praise of the Guru Ādi Śaṅkara. Thus the humble disciple Giri became Toṭākācārya.
Read More
https://en.wikipedia.org/wiki/Totakacharya