architecture building city culture elements flagstones iconic landmark leisure modern New norway norwegian opera house oslo pavement pedestrians people sidewalk sightseers stroll style surface tourists walk wall aluminium braille concave concavities convex discs metal panel pattern silver texture 12th Century ancient christian church dark decorative historical Hopperstad mediaeval medieval old ornamental ornate pillars religion religious stave tar tarred tiles Vik wooden turret carved dragon spire tourism tourist attraction weathercock gables sea dragon seadrake building work construction construction helmet high metal work pipes railing rails sacfety line safety safety harness safety helmet safety mesh scaffolding steel scaffolding tall welder welders welding workmen carving slope steps uneven