Duddul Chortenat Dotapu Chorten, Gangtok was built under the supervision of the late Most Venerable Trulshi Rinpoche after due preparations in 1945-46, in accordance with the prophecy made in 1944 by the Holiness the Dud-Zom Rinpoche. Placed inside the Chorten are a complete Mandala set of Dorji Phurpa (Bajra Kilaya), one set of Ka-Gyur holy Books, relics, complete 'Zung' (mantras) and other religious objects.
This Chorten is considered to be one of the most important
Chorten of Sikkim. Around the chorten 108 Mani-Lhokor (Prayer Wheels) are
installed. The Chorten is surrounded by Chortne Lhakhang, Guru Lhakhang,
where tow huge statues of Guru Rinpoche (Guru Padmasambahava) are
installed, Drupda (Meditation Centre), Nyingma Shede (Institute of Nyingma
Higher Studies) and many smaller monuments including the 'kudung' of the
latter Most Venerable Trulshi Rinpoche.
The Sikkim Research Institute of Tibetology and other Buddhist Studies (SRITOBS) is located near the Chorten. His Eminence Dodrup Chen Rinpoche of Sikkim has his seat at the Chorten Lhakhang and guides the disciples, including the inmates of the Drubda, in their search for higher knowledge and practice of the tenets of the Nyingma Order.