继续推荐大德州其中一个城市圣安东尼奥，那边除了海洋世界外另一个我最喜欢去的地方就是这个洞穴！ 那个导游好像介绍说有几亿年了吧，当时基本都在看这洞中的奇观没有注意她的介绍，刚开始我以为是人工，后来才知道这个洞穴全是自己形成，真的超级神奇！

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