Ballal Dhipi - Credit: Wikimedia Commons
Ballal Dhipi is a historic archeological site on the eastern flood plain of the Hooghly in Nadia, West Bengal, a few kilometres east of Nabadwip. The remains date back to the 12th century AD and earlier. A 30-ft structure of solid terracotta bricks is spread over an area of 1,300 sq ft. with a floor made of lime and sand. It is named after Ballala Sena (1160-1179) of the Sena dynasty. Read more on Wikipedia
Source: en.wikipedia.org