UNESCO's Skocjan Caves, Europe's largest underground canyon, Half Day Trip from Ljubljana.
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The Grotte di Frasassi which extends for 35km is the largest underground cave system in Europe. This subterranean world of calcareous rock formations dates back 180 million years!
Ljubljana, SloveniaImpressive underground canyon! This world known natural site, on the world heritage list of UNESCO, is one of the most beautiful cave I have ever visited.
Postojna Cave (Slovene: Postojnska jama; German: Adelsberger Grotte; Italian: Grotte di Postumia) is a 24,340 m (79,860 ft) long karst cave system near Postojna, southwestern Slovenia.
Sarawak Chamber is the largest known cave chamber in the world by area and the second largest by volume after the Miao Room in China. It is in Gua Nasib Bagus (Good Luck Cave), which is located in Gunung Mulu National Park, in the Malaysian Territory of Sarawak on the island of Borneo.
Veryovkina Cave (also spelled Verëvkina Cave, Abkhaz: ????????? ?????, Georgian: ??????????? ??????, romanized: veriovk'inis mghvime) is a cave in Abkhazia, an occupied region of Georgia. At 2,223 meters (7,257 ft) deep, it is the deepest-known cave on Earth.
Gorges du Verdon - The European Grand Canyon. One of the reasons the Gorges du Verdon is so popular is that it's accessible from both the North and the South. People come from all over to get a glimpse of the Gorges du Verdon's turquoise waters and interesting rock formations.
The first Europeans to see Grand Canyon were soldiers led by García López de Cárdenas. In 1540, Francisco Vázquez de Coronado and his Spanish army traveled northward from Mexico City in search of the Seven Cities of Cíbola. After traveling for six months, Coronado's army arrived at the Hopi Mesas, east of Grand Canyon.
The spectacular and unusual St-Léonard underground lake is the largest such lake in Europe. 300m long, 20m wide and 10m deep, this is the largest navigable underground lake in Europe. Guided tours of this unusual and mysterious site, lasting over half an hour, are given in French, German, Italian and English.
The valley of the caverns. Camuy is a town on the northwestern Atlantic coast, which with one big claim to fame: the Río Camuy Cave Park. It is the third-largest cavern system in the world, with a flowing underground river.