Each tour is packed with “unusual and little-known facts” like brief histories on how the Romans wiped their arses and the plumber who founded one of London’s early sanitary engineering companies, Thomas Crapper and Co. Not only that, but depending on the route, you may even see the Jubiloo, London’s most patriotic toilet.
Book your loo tour here. Or, if you're stateside and eager to learning everything there is to know about toilets, you're going to want hit Boston's Plumbing Museum.
Sophie-Claire Hoeller is Thrillist's associate travel editor and occasionally forms close relationships with toilets after a big night out. Follow her exploits @Sohostyle.