Every country has secrets it does not want foreigners to discover, and I have just found one in Bangladesh. It is a vast brothel, where women and girls lead painful and degrading lives, in the otherwise pleasant town of Tangail, a place of flowering trees and atmospheric old bazaars, a couple of hours drive from the capital Dhaka.
At first glance the brothel does not look any different to countless other slums in this country, which is one of Asia's poorest and most congested.
It is a densely packed collection of tin shacks, alleyways and open sewers. It has perfectly normal looking shops selling things like soap, biscuits and light bulbs.
It has a hair salon, tea stalls and a Muslim shrine. There are young children playing in every corner. But the brothel, which is only a five minute walk from the town centre, is policed by men carrying heavy wooden staves.
Its sewers have been blocked by used condoms, and at two in the afternoon it is crowded with customers taking an extended lunch break. It is one of 14 official Bangladeshi brothels. All women working here have to have legal documents proving they are over 18, but many are clearly younger than that. In theory the women can walk out of the brothel whenever they want, but in practice that seldom happens. By working here, even against their will, they become social outcasts and are rejected by their families and communities.
