Historical Period7c CE
Puranic period attested; documented by Xuanzang (7th c.), Al-Biruni (11th c.), Ibn Battuta (14th c.); Char Dhams pilgrimage 20th–21st c.
Nāra-Nārāyaṇa — where Vishnu's twin-forms performed tapas
Hindu / Vaishnava
Near Badrinath: the Nāra and Nārāyaṇa caves where Vishnu, as a pair of ascetics (Nāra + Nārāyaṇa), performed 1,000 years of tapas. Arjuna and Kṛṣṇa are said to be their re-incarnations. Pilgrimage to Badrinath traditionally includes visiting both caves.