17 "devil's Throat" Cave - Bulgaria
18 Postojna Cave - Slovenia
19 Morro Preto Cave
20 Gjábakkacave, Iceland
21 Škocjanske Jame, Slovenia
22 Reed Flute Cave, Guangxi, China
23 Caverna Pescaria
24 Azuias Cave
25 Saeva Dupka, Bulgaria
source: boredpanda
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