TO GO WITH STORY BY TRIPTI LAHIRI An employee of the Sulabh International Museum of Toilets displays a Fancy Toilet used in the 1930s at the museum in New Delhi, 27 October 2007. For India's low-cost toilet champion, each new loo means freedom not just from rampant disease, but one more chance to liberate someone from doing the awful job of disposing of someone else's waste. In the centuries-old caste system, with its ingrained fear of "pollution," the deepest revulsion has traditionally been reserved for those who do India's dirty work, such as taking away human waste from homes in buckets. AFP PHOTO/RAVEENDRAN (Photo credit should read RAVEENDRAN/AFP/Getty Images)

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Sulabh International Museum of Toilets

Delhi

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More than half of India's 1.3 billion people still don't have a toilet in their homes, but since 1970 the Sulabh NGO has worked to address India's sanitation issues, constructing new public toilets. The organisation also educates, and their small, quirky museum traces the history of the water closet from 2500 BC to modern times. It's 650m south of Dashrathpuri metro station, straight along the main road.