Dalhalla, Open-air theatre in Rättvik Municipality, Sweden.

Dalhalla is an open-air theatre housed in a former limestone quarry with steep natural walls dropping approximately 60 meters and stretching roughly 400 meters in length. The quarry widens to about 175 meters across at ground level, creating a natural amphitheater where audiences sit within the stone formations.

In 1991, former opera singer Margareta Dellefors recognized the potential of the abandoned quarry and began the process of transforming it into a performance space. Her vision led to the gradual development of the site as a venue for theatrical and musical productions.

The name reworks Valhalla, the hall of the Norse gods, into "Dalhalla" after Dalarna, inspired by Richard Wagner's operas. Since 2012 the company Dalhalla Förvaltning AB has run the site, while Föreningen Dalhall Opera keeps the original opera programme in weeks 32-33. The summer season mixes opera, choral works, jazz and popular concerts.

The arena seats about 6,000 spectators, and the record was set on 12 July 2023 when 6,156 people attended a Kiss concert. Events run from June to early September, so bring clothing for cool evenings in the open quarry. The site lies about 8 km north of Rättvik, and the steep quarry walls mean you should allow time to reach your seat.

The quarry's rough walls prevent echoes and give a soft sound, and the seats were tested so that every position hears well. This is why operas have been performed here without electronic amplification. The Austrian magazine Magazin Festspiele ranked Dalhalla fourth among the world's outdoor music venues.