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Aillwee Cave
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Aillwee_Cave">Aillwee Cave</a>]]>
Altamira
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Altamira">Altamira</a>]]>
Batu hulerne
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Batu_hulerne">Batu hulerne</a>]]>
Cango Caves
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Cango_Caves">Cango Caves</a>]]>
Cueva de las Manos
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Cueva_de_las_Manos">Cueva de las Manos</a>]]>
Cueva de los Verdes
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Cueva_de_los_Verdes">Cueva de los Verdes</a>]]>
Daugbjerg Kalkgruber
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Daugbjerg_Kalkgruber">Daugbjerg Kalkgruber</a>]]>
Den Blå Grotte
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Den_Bl%C3%A5_Grotte">Den Blå Grotte</a>]]>
Dobšiná Ishulen
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Dob%C5%A1in%C3%A1_Ishulen">Dobšiná Ishulen</a>]]>
Domica-hulen
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Domica-hulen">Domica-hulen</a>]]>
Fingal's Cave
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Fingal%27s_Cave">Fingal's Cave</a>]]>
Gaping Gill
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Gaping_Gill">Gaping Gill</a>]]>
Hranice Abyss
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Hranice_Abyss">Hranice Abyss</a>]]>
Jons Kapel
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Jons_Kapel">Jons Kapel</a>]]>
Kents Cavern
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Kents_Cavern">Kents Cavern</a>]]>
Kollhellaren
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Kollhellaren">Kollhellaren</a>]]>
Lac souterrain de Saint-Léonard
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Lac_souterrain_de_Saint-L%C3%A9onard">Lac souterrain de Saint-Léonard</a>]]>
Lascaux-hulerne
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Lascaux-hulerne">Lascaux-hulerne</a>]]>
Linville Caverns
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Linville_Caverns">Linville Caverns</a>]]>
Loltun
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Loltun">Loltun</a>]]>
Macocha
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Macocha">Macocha</a>]]>
Menneskehedens vugge
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Menneskehedens_vugge">Menneskehedens vugge</a>]]>
Mezmajskajahulen
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Mezmajskajahulen">Mezmajskajahulen</a>]]>
Mæhriske Karst
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/M%C3%A6hriske_Karst">Mæhriske Karst</a>]]>
Mønsted Kalkgruber
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/M%C3%B8nsted_Kalkgruber">Mønsted Kalkgruber</a>]]>
Neptuns Grotte
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Neptuns_Grotte">Neptuns Grotte</a>]]>
Padiracgrotten
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Padiracgrotten">Padiracgrotten</a>]]>
Postojnagrotten
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Postojnagrotten">Postojnagrotten</a>]]>
Punkva-hulerne
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Punkva-hulerne">Punkva-hulerne</a>]]>
Riesending-grotten
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Riesending-grotten">Riesending-grotten</a>]]>
Surtshellir
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Surtshellir">Surtshellir</a>]]>
Teufelshöle Pottenstein
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Teufelsh%C3%B6le_Pottenstein">Teufelshöle Pottenstein</a>]]>
Thingbæk Kalkminer
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Thingb%C3%A6k_Kalkminer">Thingbæk Kalkminer</a>]]>
Wonder Cave
<![CDATA[<br>Source: Wikipedia article <a href="https://da.wikipedia.org/wiki/Wonder_Cave">Wonder Cave</a>]]>
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