Boca do Inferno is a chasm located in the seaside cliffs close to the Portuguese city of Cascais, in the District of Lisbon.
Grjótagjá is a small lava cave near lake Mývatn in Iceland. It has a thermal spring inside.
狄奥尼修斯之耳 是意大利西西里岛东南部城市锡拉库萨的一个人工开凿的石灰石洞穴，位于Temenites 山。它的名字是因为其形状类似人类的耳朵。
由于位于这里的冷空气，该熔岩管位于Thorlakshofn镇附近，经常用冰装饰。该洞穴大约在4600年前形成，是冰岛第四长的洞穴。它的长度超过1300米，当地人说要充分利用这种体验，最好一直走到洞穴的尽头。熔岩地层简直就是例外。
The Wawel Dragon, also known as the Dragon of Wawel Hill, is a famous dragon in Polish legend.
The Caves of Drach are four great caves that are located in the island of Majorca, Balearic Islands, Spain, extending to a depth of 25 m…
Cueva de los Verdes is a lava tube and tourist attraction of the Haria municipality on the island of Lanzarote in the Canary Islands.
Visiting this cave is like entering another world - a sphere of unbelievable stone formations, crystals, lights and shadows. Breath-taking!
The Caves of Nerja are a series of caverns close to the town of Nerja in the Province of Málaga, Spain.
The Castellana Caves are a karst cave system located in the municipality of Castellana Grotte, in the Metropolitan City of Bari, Apulia,…
The São Vicente Caves are caves located in the parish and county of São Vicente, Madeira.
19 kilometres of caves and tunnels full of spectacular stalagmites and other structures carved by the thermal waters.
This mysterious place is entwined with legends about the Visigoth king Rodrigo, who received a prophecy about the end of his kingdom here.
Ihlara, formerly known as Chliára is a town and municipality in the Güzelyurt District, Aksaray Province, Turkey. The population is 2,289.
The Gruta do Carvão is an ancient lava tube located on the outskirts of the municipality of Ponta Delgada on the island of São Miguel in…
