いや、de digitale stad (the digital city)はオランダ(アムステルダム)ですね。ソースがどっちも.deのページなのでややこしいですが。
All four <virtual communities> that were creating a stir at the time were represented at ars electronica 1995: : <De Digitale Stad? (DDS; The Digital City)> from Amsterdam, the <Internationale Stadt> (I.S.) from Berlin, <t0 Netbase> (pronounced: T Null Netbase) from Vienna and <The Thing> from New York. [...]
てことらしいです。一応。