The Krubera Cave (or the Voronya Cave sometimes spelled Voronja Cave) is the deepest known cave on Earth. It is located in the Arabika Massif of the Gagrinsky Range of the Western Caucasus, in the Gagra district of Abkhazia, Georgia’s breakaway republic. The cave remains the only known cave on Earth deeper than 2,000 metres.The difference in the altitude of the cave's entrance and its deepest explored point is 2,191 ±

In Katowice, Poland.

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Leaning Tower of Pisa in Philadelphia, PA, USA

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