Leopoldov Prison (fortress) built
1855 CE.
Shown on the map at 48.444°, 17.778°.
The Leopoldov Prison (Slovak: Ústav na výkon trestu odňatia slobody a Ústav na výkon väzby Leopoldov) is a Slovak state-operated penitentiary facility located in the town of Leopoldov. Initially a 17th-century fortress built to defend against Ottoman Turks, it was converted into a high-security prison in the 19th century, and it used to be one of the largest prisons in the Kingdom of Hungary under the Habsburg monarchy. In the 20th century, it became known for housing political prisoners and dissidents under the Stalinist regime, particularly the future Communist President of Czechoslovakia Gustáv Husák, who was imprisoned after an intra-party purge. After the Velvet Revolution of 1989, the Leopoldov Prison was the place of a series of violent revolts, prison escapes, and riots, requiring multiple interventions led by high-ranking government officials, including members of the Cabinet and the Prime Minister, who personally conducted negotiations and reforms inside the prison.
Text from the Wikipedia article Leopoldov Prison, licensed CC BY-SA 4.0.