Lalbagh kella
For a long time, it was believed that the fort was a combination of three buildings (the mosque, the tomb of Pari Bibi, and the Diwan-i-Aam), along with two large arcades and a partially ruined fortified wall. Recent excavations by the Lalbagh kella Bangladesh Archaeological Survey have revealed the existence of other structures.
There was a large bastion at the southwest corner of the southern fort wall. To the north of the southern fort wall were several buildings, stables, administrative buildings, and to the west was a beautiful roof garden with a reservoir and fountain.
The residential part was located east-west of the fort wall, mainly southwest of the mosque.
The southern fort wall had five towers at regular intervals, each two locks high, and the western fort wall had two towers, the largest of which was at the southern main entrance.
The towers had an underground tunnel. The central area of the fort was occupied by three main buildings. The Diwan-i-Aam and Hammam Khana in the east, the mosque in the west and the tomb of Pari Bibi in between, in a line but not at equal distances. A water channel with several fountains at regular intervals connected the three buildings from east to west and north to south.
Diwan-i-Am
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Hammam Khana was originally used as a residence for the subedars. This building in Lalbagh Fort was used for two purposes: Hammam Khana (as a residence), Diwane Am (as a court). The ground floor of this building was the residence or Hammam Khana and the upper floor was the court or Diwane Am. Shaista Khan lived in this building and this was his court. From here he conducted all judicial proceedings.