Constructed in 1945 under the leadership of Trullshi Rinpoche, head of the Nyingma order of Tibetan Buddhism, Do-Drul Chorten Stupa is the biggest and most important Stupa in Sikkim. Inside this stupa, there is a complete set of Dorjee Phurba, Kangyur relics (Holy Books) and other religious objects, while there are 108 Mani Lhakor or prayer wheels around the stupa. The devotees turn these prayer wheels to read and chant the 'mantra' of "Om Mane Padmane Hum" engraved on them.