Prohodna

Stara_Planina
Prohodna 洞穴是保加利亚最著名、交通最便利的洞穴之一。巨大的入口以及洞顶的天然开口有如“窗口”和“眼睛”，自然光线通透射入，因此这里被称为“上帝之眼”。
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