When mining stopped at an isolated limestone quarry in central Sweden in 1990, the local area was left with a 55-metre-deep industrial pit cut into the pine forests outside Rättvik. Just a year later, a former opera singer discovered that the abandoned quarry had remarkable natural acoustics. Today, the former mining site has become Dalhalla, an internationally known open-air concert venue that attracts more than 100,000 music fans to Dalarna every summer.
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