Located inside the Allahabad Fort complex in Patalpuri Temple, Akshaya Vat or Akshayvat is an ancient fig tree. After 2011, this tree can only be visited after seeking permission Commandant of Allahabad Fort's Ordnance Depot. Only on a single day during the Kumbh Mela festival, this sacred site is open for public visits.
The legend behind this sacred and immortal tree is woven in Hindu mythology. It is believed that Lord Narayana submerged the entire earth for a brief moment when the sage, Markandaya asked him to present his divine strength. Upon flooding, it was only the Akshayavat Tree that stayed afloat. Thus, it is believed to be the immortal and holy banyan tree.