An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Head underground and take a tour of the city's working sewer system, and see the underground river Senne, which defined Brussels for centuries before being covered in the 19th century.

To literally keep their waste out of their own backyards, the citizens of this English city built an impressive sewer system that is still in use today.

The curious underground history of keeping Paris clean.

A well-preserved network of cavernous tunnels have spent silent centuries removing Toronto's waste.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

Near the mouth of the Yodo River, this museum offers visitors six floors of hands-on learning about Osaka's raw sewage.

A bright and wacky exhibit answers every question you may have had about human excrement, flatulence, and more.

Norway has built what may be the world's most beautiful public toilet.

This tiny museum's sizable collection is jammed into a former underground public toilet.

The ancient latrines of the Greeks, in all their public glory.

Dedicated to the unsung history of human waste.

The southernmost toilet in the British Isles.

A quirky collection flush with information on commode culture from ancient times to modern day.

The toilet-shaped house of South Korea's sanitation pioneer is now a museum to the john.

Modern art meets modern convenience in possibly the world's most architecturally important public bathroom.

What can compare to the comforting sound of 10,000 toilets running?

A master plumber has turned his love of art and toilets into a folk museum that's not taking the piss.

It's gunky, it's gross, and it's been freed from the sewer and put on display.

An otherworldly musical haven in The Big Easy.

Inside the unassuming cemetery chapel is a magnificent stained glass window and mosaics.

From economic backbone of a community to deadly diving hole, these former stone quarries are now a park for rock climbers and graffiti artists.