Bára Šilha
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Lehman Caves  Delicate rare limestone formations make the Lehman Caves one of the   most wonderful underground chambers on the globe. Located in the Great Basin   National Park, Nevada, USA, the cave was discovered in 1885 by Absalom   Lehman.

Lehman Caves Nevada Delicate rare limestone formations make the Lehman Caves one of the most wonderful underground chambers on the globe. Located in the Great Basin National Park, Nevada, USA, the cave was discovered in 1885 by Absalom Lehman.

Gorges de l’Areuse, Switzerland

Gorges de l'Areuse, Switzerland The Val de Travers is a Jura mountain valley perpendicular to the main valleys (hence the name). The river Areuse has cut itself steeply through the soft limestone and clay sediments. It's one of those Roman bridges too.