callao cave interior view 1st chamber with stalactites and stalagmites formations |
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| navigate by keyword : ancient archaeology biology cagayan callao cave chamber condition formation formations geography geology historical interior limestone location minerals natural penablanca philippines province shapes stalactites stalactities stalagmites stones textures tuguegarao walls creepy scary |
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| mirrored view of entrance to the 1st chamber i callao cave filled with natural formations of stalactities and stalagmites on walls. location : penablanca, cagayan province, philippines. |
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