Balck Hole of Kolkata

Nothing I can found over there

The Black Hole of Calcutta was a dungeon in Fort William, Calcutta measuring 4.30 × 5.50 ⁠metres (14 × 18 ⁠⁠feet), in which troops of Siraj ud-Daulah, the Nawab of Bengal, held British prisoners of war for three days starting on 20 June 1756. John Zephaniah Holwell, one of the British prisoners and an employee of the East India Company, said that, after the fall of Fort William, the surviving British soldiers, Anglo-Indian soldiers, and Indian civilians were imprisoned overnight in conditions so cramped that many people died from suffocation and heat exhaustion, and that 123 of 146 prisoners of war imprisoned there died.

The location marker here is correct, but it will not be obvious that you are there, especially if you are looking for an actual black hole, or indeed the monument seen in most of the pictures here. This is very misleading.nnThe monument in most of the pictures is indeed a memorial to those involved in the events at the black hole, however this can be found about half a kilometre southwest of the marker position, in the grounds of St. John's Church.nnThe marker on the map signifies the supposed original location of the black hole, back when Fort William originally stood here, before moving to its current location. What you will find in reality is just a concrete slab in a gated alleyway on the northern flank of the GPO... there is nothing more to be seen, and no indication of the history of the site is present here.nnThat said however, a memorial plaque did once rest on one of the walls overlooking the alley; this can now be found in its new home, within the Postal Museum just around the corner. Sadly (and somewhat bizarrely), no pictures are allowed of this. The very friendly lady on the front desk was kind enough to escort me to the alley site and explain some of the history, but as said, there's not really anything to be seen.

Its like the black hole of Calcutta in there

The Black Hole of Calcutta was a dungeon in Fort William, Calcutta measuring 4.30 × 5.50 ⁠metres (14 × 18 ⁠⁠feet), in which troops of Siraj ud-Daulah, the Nawab of Bengal, held British prisoners of war for three days starting on 20 June 1756. John Zephaniah Holwell, one of the British prisoners and an employee of the East India Company, said that, after the fall of Fort William, the surviving British soldiers, Anglo-Indian soldiers, and Indian civilians were imprisoned overnight in conditions so cramped that many people died from suffocation and heat exhaustion, and that 123 of 146 prisoners of war imprisoned there died.