The Atta Cave or Attendorn Dripstone Cave in Attendorn is one of the largest dripstone caves in Germany.The cave was discovered during the quarrying of limestone at the Bigge Valley Limestone Works on 19 July 1907 and was opened up by the owners to tourists that same year. Today the Atta Cave is the most-visited show cave in Germany, receiving around 350,000 tourists per year, and is an important economic factor for the town.Amongst its attractions are numerous calc-sinter flowstone drapes, colourfully tinctured by iron oxides. There are also many stalactites, stalagmites and stalagnates. Several pieces of calcite crystal formations were moved into the public area of the cave in order to be displayed there.HistoryThe formation of the cave started in the Devonian period (about 400 million years ago) when the region of the present-day cave still lay in a bay of the sea. In the layers of limestone then being laid down, caverns were formed over time by carbonic acid weathering caused by the rainwater seeping through it as well as mixed corrosion (Mischungskorrosion).An earthquake several thousand years ago broke several of the speleothems. The caves are also inhabited by bats that get into the cave through rock crevices in the hilltop.
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