Time Out says
Viadukt is a stretch of shops, restaurants and bars built into the arches of an old railway viaduct. It's become one of the happening places to be in town.
This stretch of shops, restaurants and bars is built into the arches of the old railway viaduct that runs between the bank of the river Limmat and Hardbrücke station. It has become one of the places to be in town. During the day, visit the quirky shops (don’t miss Westflügel, a book shop with a carefully curated selection) and buy organic delicacies at the Markthalle. The bars and restaurants attract a busy crowd in the evening, and there is always an event or concert going on in one of the arches.