Cellular Jail, Andaman & Nicobar Island..

The Cellular Jail, also known as 'Kālā Pānī' (Hindi: ۘकाला पानी, transl. 'Black Water'), was a British colonial prison in the Andaman and Nicobar Islands. The prison was used by the colonial government of India for the purpose of exiling criminals and political prisoners. Many notable independence activists, including Sardar Singh Artillery, Diwan Singh Kalepani, Yogendra Shukla, Batukeshwar Dutt, Shadan Chandra Chatterjee, Sohan Singh, Vinayak Savarkar, Hare Krishna Konar, Shiv Verma, Allama Fazl-e-Haq Khairabadi, and Sudhanshu Dasgupta were imprisoned here during the struggle for India's independence.[2] Today, the complex serves as a national memorial monument.[3]
(from Google)