Berwaldhallen (Berwald Hall) is a concert hall situated in a park landscape at Dag Hammarskjoldsvag 3 in the ostermalm district of Stockholm, Sweden. Construction on the building began in 1976 based on a design by architects Erik Ahnborg and Sune Lindstrom. The hall is shaped as a hexagon.The seating is 1,302 places, of which 482 are in the stalls.The hall won a Europa Nostra architecture award as an admirably sensitive designed concert hall .The hall was originally supposed be located at the end of the Karlavagen esplanade but was moved further along the water. The site was selected to allow the hall to merge with nature and was positioned in the rock so it would not look too large. The interior hexagonal shape was partly for acoustic reasons, but the hall had to be acoustically adjusted several times subsequently. Gaps between the wood panels were adjusted to control the reverberation time.