Visitors in a large cave with stalactite and stalagmite formations, Dau Go Cave, in a limestone karst in Halong Bay, Vietnam

- Image ID: FD0D1B
Visitors in a large cave with stalactite and stalagmite formations, Dau Go Cave, in a limestone karst in Halong Bay, Vietnam
Nigel Cattlin / Alamy Stock Photo
Image ID: FD0D1B