Chelsea
This is the city's hottest venue for underground music. From all over the continent, the best bands and DJs are imported to entertain the gyrating throngs who gather here in a sort of techno-pop atmosphere. The pulsating club lies in one of the arches of the old railway train tracks that divide the north of the city from the historic core. Open nightly 7pm-4am.
Address: Lerchenfelder-Grtel / Stadtbahnbgen 29/30, 1080 Vienna
Tel: (+43) 01 4079309
Website: www.chelsea.co.at

U-4
The origins of this club go back to the 1920s, and it continues to revitalize itself with every new generation of nightclubbers. Today it's cited as one of the trendiest clubs in Vienna. Depending on the schedule, you're likely to experience such themes as Italian night, salsa/Latino night, and - every Thursday - gay night. It's open nightly 10pm to around 5am, depending on business.
Address: Schnbrunner Strasse 222, 1120 Wien
Tel: (+43) 01 8171192
Website: www.u-4.at

Flex
No other dance club in Vienna has a history as long, as distinguished, and as "flexible" as this one. This industrial-looking venue is set uncomfortably between the edge of the canal and the subway tracks. With exterior graffiti that includes the scrawlings of street artists going back to the '70s, it's a prime venue for post-millennium fans of electronic music.
Address: Am Donaukanal, 1013 Wien
Tel: (+43) 01 5337525
Website: www.flex.at