Photo: Mathallen OsloHoused in a former iron foundry beside the Akerselva at Vulkan, Mathallen is Oslo flagship food hall, gathering dozens of specialist traders and small eateries under one roof. You can graze from Norwegian cheeses and cured meats to fresh oysters, tacos and pastries, then take home coffee, chocolate or seafood from the counters. Come hungry and plan to browse rather than plan, and use it as the perfect launch point for a wander up into Grunerlokka.