The Talatal Ghar is a palace which was initially built as an army base. It houses two secret tunnels, and three floors below ground level which were used as exit routes during the Ahom wars (and which give the structure its name).
After Swargadeo Rudra Singha’s death the Talatal Ghar, which together with the above-ground Kareng Ghar constitutes the “Rangpur Palace”, went through many architectural alterations to its structure, which resulted in its irregular shape.
Swargadeo Rajeswar Singha added the three floors below ground, which make up the Talatal Ghar. This is made of brick and an indigenous type of cement (a mixture of Bora Chaul – a sticky variety of rice grain – eggs of hens, etc.). The Talatal Ghar had two secret underground tunnels. One, about 3 kilometres in length, connected the Talatal Ghar to the Dikhow River, while the other, 16 kilometres long, led to the Garhgaon Palace, and was used as an escape route in case of an enemy attack.
Visitors nowadays can only view the ground floor, the first floor, and what remains of the 2nd and 3rd floors of the Kareng Ghar. The floors of the Talatal Ghar below ground have been sealed off, and most of the wooden parts of the palace have disappeared over time.
The Rangpur Palace was once surrounded by a brick fortification and an earthen fort (Garh) with dikes filled with water. There is a Khar Ghar (gunpowder and ammunition store) near the palace.