Vienna is one of the safest cities in the world. At night it's not uncommon to see women walking home alone or elderly people walking dogs or using public transport. Tourists normally only experience petty crime, such as pickpocketing or the very rare money scam. There are, however, a few places to avoid, especially at night. Karlsplatz U-bahn Station is a well known spot for drugs and drug addicts, as is the Prater and Praterstern, and Mexikoplatz is supposedly a black-market centre. Südtirolerplatz, the S-Bahn and tram stations along Margareten- and Wieder Gürtel can be a little unnerving after dark.