Black Hole of Calcutta Tourist attraction in Kolkata, India

On the outbreak of war, Subhas Chandra Bose advocated a campaign of mass civil disobedience to protest against Viceroy Lord Linlithgow's decision to declare war on India's behalf without consulting the Congress leadership. Having failed to persuade Gandhi of the necessity of this, Bose organised mass protests in Calcutta calling for the 'Holwell Monument' commemorating the Black Hole of Calcutta, which then stood at the corner of Dalhousie Square, to be removed. He was thrown in jail by the British, but was released following a seven-day hunger strike. Bose's house in Calcutta was kept under surveillance by the CID.

Source: Wikipedia