Externally, Chika Mosque or Chamkan Mosque resembles a Mosque or a Masjid. However, once you enter the Mosque, the absence of Mihrabs inside the building, the rows of huge pillars, and the use of elements from the Hindu Temple make. it evident that the building could not have been a mosque. Chamkan or Chika Masjid was constructed by Nasiruddin Mahmud Shah between 1435 and 1459 C.E. The Mosque constructed with the red terracotta bricks has an enormous single dome. Locally, the word “Chika” for the Mosque is derived from the local name for ‘bats’. Owing to the fact that long after the desertion and wrecking of Gaur, the Chamkan Mosque was filled by ‘chikas’ or ‘bats’. In the book written between 1879-1880, Major General Alexander Cunningham of the Royal Engineers asserts in his book about Gaur that Chamkan or Chika Mosque was certainly utilized as a prison or “chor-khana” by Sultan Hussain Shah(1493-1519 A.D). Despite being in ruins, the bats, however, are still very much there