Places you want to visit before your death - Sonagachi
Ankur Gupta
Sonagachi is the largest red-light district in Kolkata. The area came to be known as Sona Gachi from a sufi saint Sona Ghazi whose tomb (mazaar) is located in the locality.[1] It is an area with several hundred multi-story brothels, and around 10,000 sex workers. [2] Sonagachi is located in North-Kolkata at 
22°35′15″N 88°21′35″E / 22.5875°N 88.35972°E / 22.5875; 88.35972, near the intersection of Chittaranjan Avenue Sova Bazar and Beadon Street, just north of the Marble Palace.
Several NGOs and government organizations operate here for the prevention of sexually transmitted diseases (STD) including AIDS.
Sonagachi project is a prostitute's cooperative that operates in the area and empowers sex workers to insist on condom use. It is credited with keeping the HIV infection rate among the prostitutes at 5 per cent, much lower than in other Indian red-light districts. [3]
The Kalighat Road is a small street next to the Kali temple, close to the metro station Kalighat. There is small red-light district.
Kidderpore is an area in the south of Kolkata. There is small red-light district on Mushigunj Road, near The Statesman's printing press.
In Bowbazar, oppposite the 'Calcutta Medical College and Hospital' there is a small Shiva temple. The address is 21, College Road. The small street left of this is another, small red-light district.
Baruipur is a small village south of Kolkata. There is small red-light district. South Kolkata Garia More(formerly) was an area. Right now it shifted little bit inside.
Streetwalker
Streetwalkers work in Esplanade Crossing, opposite of cinema ‘Metro’ and in the street between Elite Cinema Hall and Regal Cinema Hall. Jagat Cinema near Sealdah station and under sealdah fly over they use to move, and another place is ultadanga fly over.and garia
Private brothels
There are numerous private brothels and they are everywhere, but impossible to find without a guide[citation needed].
Call girl
Call girls operate independently and through pimps or escort agencies. Prostitution is operated from many beauty parlours and massage parlors in the city.[4][5] Pimps (commonly called agents) in nightclubs, pubs, star hotels and floorboys acting as agents generally keep catalogue with pictures of the call girls.[5] The girls operate in places like flats, hotels. etc.[6] Generally the call girls go to the rooms in star hotels. However, when the client cannot provide a place of convenience, the agents provide one and the place is generally decided on before.[5]
Call girls in Kolkata come from middle class, upper middle class and upper class family. They may be executives, housewives, college student or actress.[5][6]
The Kolkata Police have connections with many call girls working as their informers. Many criminals like to spend time with the girls. Hence some call girls are used by the police to get information about suspected criminals.[7