Third Man Sewers

In 1949, Orson Welles ran through these sewers as the black marketeer Harry Lime, and a network of cholera-era drainage tunnels became one of the most famous film locations in cinema history. Carol Reed's "The Third Man" — regularly voted the greatest British film ever made — used Vienna's actual sewer system for its climactic chase scene, where Lime flees through echoing tunnels with Joseph Cotten and the authorities in pursuit.

The tour enters through the original staircase used in the film, descending into one of the older sections of the 2,500-kilometre sewer network. These particular tunnels were built in the 1830s as cholera canals, designed to drain contaminated water after epidemics that killed thousands. Half a billion litres of wastewater flow through the wider system every day, but the tour section is mercifully separated from the active sewers by modern engineering.

What made the sewers so perfect for the film was the atmosphere of post-war Vienna itself. The city was divided into four zones — American, British, French, and Soviet — and the underground passages were the one place where those borders didn't exist. Smugglers, black marketeers, and spies used the tunnels to move between zones unseen. Harry Lime's penicillin-diluting racket wasn't fiction; it was based on real cases that killed real people.

The tour uses modern projection and lighting to recreate scenes from the film while explaining the actual engineering and history of the system. It's dark, it's damp, the acoustics are extraordinary, and you emerge blinking into the daylight of Karlsplatz with a deeper appreciation for both cinema and municipal infrastructure — a combination only Vienna could pull off.