洞穴也可以這麼漂亮？#1已經傻眼了！太美了！
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