What is taj mahal of bangladesh?

There is no such thing as the "Taj Mahal of Bangladesh." Taj Mahal refers specifically to the famous monument in Agra, India that was built by Mughal Emperor Shah Jahan in memory of his wife Mumtaz Mahal. Bangladesh has its own ancient architectural wonders, such as the ruins of the ancient Buddhist monastery at Paharpur and the 14th century mosque of Bagerhat, but there is no equivalent to the Taj Mahal in Bangladesh.