The Cellular Jail, located in Port Blair, India, is a former colonial prison that was used to incarcerate political prisoners during the British Raj. Built in 1906, the jail is now a national monument and serves as a reminder of India’s struggle for independence. The jail is made
From Wikipedia
The Cellular Jail, also known as 'Kālā Pānī', is a former British colonial prison in the Andaman and Nicobar Islands. The prison was used by the colonial government of India for the purpose of exiling insurgents and political prisoners. Many notable independence activists were imprisoned there during the struggle for India's independence. Today, the complex serves as a national memorial monument.