Far from the wide, tree-lined avenues of central Delhi that host most of the city’s museums and galleries, this unexpected treasure trove of toilet history lies in the headquarters of the Sulabh International Social Service Organization in West Delhi. The largest sanitation and social welfare NGO in India, Sulabh International has built over 1.3 million household toilets over 45 years of operations.

Dr. Brindeshwar Pathak, the founder of Sulabh International and the museum’s curator, is obsessed with the state of human waste management in India, and consequently with toilets. He started the museum in 1992 to “raise awareness, educate students, inform policy makers and act as a resource for researchers.”

It also attracts upwards of 10,000 intrigued tourists and locals in a year, amused by that most perennial source of humor — poop. Situated in a low, concrete room with (rather apt) blue and white bathroom floor tiles, it’s an unlikely setting for what TIME Magazine recently deemed one of the weirdest museums in the world.

The museum showcases a chronological journey through the history of sanitation and hygiene, dating back to the advanced squatting toilets in 2500 B.C Mohenjodaro (in current day Pakistan) and the sanitation arrangements in ancient Egypt and Babylon. At the other end of the timeline are innovations from the modern age, such as the first porta-potty, a temperature-controlled Japanese toilet seat, an electric toilet from Texas that incinerates waste into ash, and a solar-powered toilet from South Africa that dehydrates feces into manure (the resulting little balls of manure are displayed in nearby Tupperware boxes).

There’s also a wall dedicated to “toilet humor” — including posters, comic strips, and not one but two newspaper clippings about Jennifer Lopez. “Her fiancé Ben Affleck gifted her a toilet seat that was encrusted with rubies, pearls and diamonds,” Rajput explained matter-of-factly.

But there’s nothing quite like Early and Mid Modern European history to enthrall the most avid of toilet aficionados. This section of the room is peppered with poetry regarding “nightsoil’, literary odes to bodily functions, and replicas of ornate chamber pots and washbasins. And not to forget, toilets masquerading as furniture.