Located along (and in) the City Pond, the Town Hall of Reykjavik is a modern building with lines with draw you into the building itself. From the west you enter the building over a slightly curving path over the water which on many days will give you time to check out the many birds which spend time in the pond.The building is open to the public and features a large 3D map of Iceland which you can view in the lower level of the building.
