Berlin goes late or all night , especially in Kreuzberg , where Wurgeengel -LRB- Dresdener Strasse 122 , www.wuergeengel.de -RRB- serves cocktails in a smoky red room to an attractive crowd , and Mobel Olfe , Reichenberger Strasse 177 , www.moebelolfe.de -RRB- caters to a beery gayish crowd of wall-to-wall bodies until 3 a.m. Techno has roots in Germany , and enthusiastic dancers still seek out D.J . 's at the Russian discos .