Sonargaon originally Svarnagrama or Suvarnagrama, denotes an ancient janapada (territory) of Vanga stretched on both banks of the Brahmaputra, which is said to have originally been inhabited by a race called Svarna-bhushita, literally meaning ‘dressed up with gold’ and signifying a people traditionally adorned with gold-wear. The antiquity of this region may be traced back to the period of Kuru-Pandava war described in the Mahabharata, and even earlier. Its importance in ancient time is borne by the traditional holy swimming places of Langalband and Panchamighat on the west bank of the Old Brahmaputra. The ancient territory of Suvarnagrama was originally bounded on the east by the Meghna, south and west by the Dhaleswari and Sitalakshya respectively, and north by the Brahmaputra forming northern extremity of the modern greater Dhaka district.
This is the city where you will find the traditional environment of old capital of Bengal. I am sure this old city will blow your mind.